I need to change my admin password and im logged into the admin account now ..but i do not remember the original password.. how do i do that?

If you bought it with Snow Leopard installed, insert the install disk and restart, double click the install disk and go to the utilities and you can reset the admin account.

Click on the apple in the upper left corner of the sreen, About This Mac and it will tell you the operating system.

Forgetting""" passwords etc..

Here's a Tip...within your Address/Contacts - use a psuedo name/within the phone number/email address

insert the password...😉

Under where it says Mac OS X, what is the version?