TS1440 how do I reset my password on my macbook pro if I've forgotten my old password?

I have a relatively new (less than 6 months old) macbook pro.  Somehow the password got screwed up when I tried to reset it.  I can log into my macbook pro, but when I went to reset the password (so it would require it when I turned it on and after it went to sleep {I live in a house with 3 roommates and do this to avoid it being used as a public computer} as well as needing it to do updates or install new software)  I don't have the old password, so it won't let me set a new password.  I'm not super technical, but I can follow instructions.

Welcome to Apple Support Communities
To reset the password, first try to reset it with your Apple ID following the steps of this website > http://support.apple.com/kb/HT1274
If it doesn't work, reset it using OS X Recovery > http://discussions.apple.com/docs/DOC-4101

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