Imac 17 inch wanna format but no cd and password.

I have bought a used imac 17 inch,after i bought the system the told me i need to format to change the user settings were as he does'nt have the OS X cd and the password.i have tried the tips found on the net ,but nothing works .can someone tell me were can i buy this OS X cd or show me how to format this system without CD or Password.
Thanks .

You can't erase the internal drive without an installation DVD or other system and still have an usable computer. Phone Apple Support and order replacements, or purchase a retail DVD compatible with your machine.
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