If you forgot your mac admin password you can reset by the following method:
Create a new admin user:
Start the computer while holding down the command + S key (you’ll see the black terminal kind of screen with loading text)
\sbin\mount -uw / [enter] rm /var/db/.AppleSetupDone [enter] reboot [enter]
After the reboot, you’ll see the animated background with different languages, and will get a popup asking to register. Just follow the steps and you’ll be creating a new ‘Admin’ user.
Now you got an account with full admin access. Go to the Apple->System preferences->Users & groups and you’ll see all other account. Select the account you want to reset the password and reset it to a memorable one! 🙂
p.s I will put some screenshots later…