Please help why doesn't command s single user work?

Why doen't my mac command s single users mode not work?? i forgot my admins password and i broke the disc like 3 months ago so im left with no choise
please help asap

Single user or verbose mode is for troubleshooting, not changing the admin password.
According to your profile you are runing Lion so an alternative may work for you.
OS X Lion: Apple ID can be used to reset your user account password
Or here >  Reset a Mac OS X 10.7 Lion Password

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