How do i reinstall mac os x from the disk to reset the system and to delete the admin passwords

hi guys iv recently got the mac os x install disk from applecare and iv started the system but to reinstall the os its asking for a admin password which i dont have hence the reinstall how do i get around this???

OS X: Changing or resetting an account password
Reset mac mini admin password: Apple Support Communities
Forgot Mac Password? How to Reset Your Mac Password (with or without CD)

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