I need help changing the previous owners id and password

I bought a use macbook Lion os-x 10.7.5 software.  My apple id and password don't work because the previous owners password is still in there.  I have tried to get to the Disc Utility by restarting and holding the control, alt/option and r keys but it just starts up to the normal screen.  No disc utility.  Any suggestions?
thanks, carl s

If you started holding the Option key, and only saw Macintosh HD rather than that and  Recovery, then it seems that Recovery is missing or damaged on your computer. Some models of MacBook will start in Internet Recovery if you use Command Option R; although it seems that yours is not suitable.
If you are able to start in Single User mode (hold Command & S at the chime), then you may be able to follow the steps below to change the password. Print them out first, & make sure that you know the name of the user that you wish to change. This won't alter the AppleID name & password that were used to install previous software, so you may still need to erase & (re)install yourself; starting with the relevant install DVD(s) which are usually available from Apple for around $20, if you call with the serial number.
Start in Single User mode & wait for the :/ root#    prompt to appear
type        mount -uw /        then press enter (the slash is important)
again, wait for the :/ root#    prompt
type    passwd username  
then press enter (swapping 'username' for the name you need to change the password for)
You should see
:/ root# passwd username
Changing password for username
New password:
You now type a password, which won't be shown onscreen, then press enter
then you should see
Retype new password:
type the same new password again, then press enter.
wait for the :/ root#    prompt, then type     reboot    & press enter

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