Breaking Imac Password Protector?

I bought a used Mac and i can't achieve to change the administator password so i can download limewire and stuff because it have little snitch. What can i do to get around it?

Breaking Imac Password Protector?

start your mac near the apple cd (hold c at boot up) that came near the computer. wait until it loads and later go to the utilities menu. Choose the loose change password from the drop down and change the admin users password

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