Lucky me.  Both old and new OS on my MB Pro.  How do I eliminate the old?

Long story short:  Last night, I installed OS 10.5.7 (this is what it shows on the disc and I purchased my MB in 2009) in order to replace my keychain password and now I don't know how to update to the new architecture.  "About This Mac" shows the current version as 10.5.8.  Prior to this, I was running the most current Version (2011) of OS - I'm not sure what version that was but not Snow Leopard.
I didn't archive (I thought I did but I guess I didn't) but my 2011 files were saved in a folder that was created and titled with the date and time.  I can work within my 2011 user settings, primarily, but a few programs will not function (e.g. Apps).
Basically, I just want to run the computer as I did a few days ago.
If anyone has any helpful thoughts, tips or pointers, I would most certainly appreciate it.
Thanks in advance.

If you're also having problems changing the account on your iOS devices, go to https://appleid.apple.com, click Manage my Apple ID and sign in with your current iCloud ID.  Click edit next to the primary email account, change it back to your old email address and save the change.  Then edit the name of the account to change it back to your old email address.  You can now use your current password to turn off Find My iDevice, even though it prompts you for the password for your old account ID. Then save any photo stream photos that you wish to keep to your camera roll.  When finished go to Settings>iCloud, tap Delete Account and choose Delete from My iDevice when prompted (your iCloud data will still be in iCloud).  Next, go back to https://appleid.apple.com and change your primary email address and iCloud ID name back to the way it was.  Now you can go to Settings>iCloud and sign in with your current iCloud ID and password.

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