MacBook Pro: change registration/user?

I bought a Macbook Pro online (eBay). It s still new, and has a AppleCare warranty up to 2012. It was preinstalled with lots of softwares that why I bought it.
I know when you first buy a Macbook, the first time it boots up you'll be asked to type your name, email and registration.
Since my Mac has been opened and programs installed, I didn't see the first time boot uo. How can I change the registration info?
Thanks in advance.

1. Boot to single user mode by restarting and after the chime press and hold down the COMMAND-S keys until a black screen with white type appears.
2. At the prompt, type the following commands pressing return after each command line:
/sbin/fsck -yf
If you do not receive a "Filesystem OK" message then repeat this command until you do. If after seven tries you still do not receive a "Filesystem OK" message, then the system is corrupted and needs to be reinstalled.
mount -uw /
cd /private/var/db/netinfo
mv local.nidb local.old
rm ../.AppleSetupDone
shutdown -r now
The second-to-last command above will cause OS X to think that the operating system is newly installed, and when the new owner starts up the computer it will send him/her to the startup wizard where he/she can start a new user without reinstalling.

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I'm afraid that you may be confusing two different 'passwords' - there's your Apple ID (the user name and password that you used to get into these forums) and then there's your computer user name and password - usually two seperate user names and passwords.
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Caveat to the above.
If your Mac did not originally come with Lion Preinstalled, early releases of early 2011 models and older, and originally had Snow Leopard installed the original owner should of supplied the Mac OS X System Discs with the system. If that person didn't you should order them from Apple at a small fee, and don't lose them.

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Does this mean I have some sort of malware?
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You likely have a corrupt cache file someplace in OS X.
12: OnyX cache cleaning
This routine cleans all possible corrupt caches, doesn't delete your data or programs.
Apple doesn't include a easy for the user, system wide cache cleaning process in OS X, something they need to consider implementing.
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If any of the initial checks OnyX does gives a warning, then Stop and report, you have a serious drive or other issue.
This will give OS X a enema of sorts (won't delete file or programs) and let it rebuild all the cache and other files, including Spotlight.
You must be through running all the maintenance and cleaning aspects as this is a "catch all" method and any number of corrupted caches may be responsible for your issues. Don't worry, OS X will work fine (and likely faster again) after the caches are cleaned out and rebuilt from their original sources provided you REBOOT when finished using OnyX.
http://www.macupdate.com/app/mac/11582/onyx https://en.wikipedia.org/wiki/OnyX
List of proven OnyX successes:
https://discussions.apple.com/message/18377471?ac_cid=sa123456#18377471
OnyX also has a Verify > Preferences
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Step by Step to fix your Mac

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I guess I deserve to have this happen because I bought "second-hand." So thanks for that judgement. That's obviously what I came here for.
I appreciate the replies. Just posting to get advice from others who may have similarly experienced problems with Apple and shipping addresses, customer info, etc.
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asdftroy wrote:
If you did read my post then you would have saw that the option is there, but that is not entirely what my inquiry is about. The option isn't working as intended, and I was wondering if anyone had the same issues as me. Thanks anyways.
Anyone else?
The way you responded to someone trying to help you probably means others will be hesitant to try.

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Hi rosaqt,
I see that you are having some issues with your ability to log in to your user account on your computer. If this issue is related to passwords, you will want to see the information in the following article:
OS X Mavericks: If you forget your login password
http://support.apple.com/kb/PH14120
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http://support.apple.com/en-us/HT201262
Thanks for being a part of the Apple Support Communities!
Regards,
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http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i5-2.4- aluminum-15-mid-2010-unibody-specs.html
http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.2- 15-early-2011-unibody-thunderbolt-specs.html
http://www.everymac.com/systems/apple/macbook_pro/specs/macbook-pro-core-i7-2.3- 15-mid-2012-unibody-usb3-specs.html
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It's possible that the water caused your hard drive directory to be corrupted when the logic board shorted out. You may want to try repairing the now-external drive with Disk Utility's Repair Disk routine. If it reports making any repairs, run it repeatedly until it reports that the disk "appears OK". Then try Migration Assistant again.
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MacBook Pro: change registration/user?

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