How can i reset an admin password?

i got my mac from a friend, the mac has an admin password in the only account, and he cant remember it, i dont have the CD's that came with the mac also, but my friend has ones of his macbook pro, both are for the same OS X, 10.6.7, any help? can i use the MBP CD's? if yes, how do i reset the password using them?

Hi, lisafromspanish fork.  
Thank you for visiting Apple Support Communities. 
I am not sure which operating system you are using; however, here are the steps that will walk you through changing an admin account password. 
OS X: Changing or resetting an account password
http://support.apple.com/kb/ht1274
OS X Mavericks: Reset a login password
http://support.apple.com/kb/PH14325
Cheers,
Jason H.

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