How do I uninstall Mountain Lion and restore the prior program?

I am having too much trouble with my iMac since purchasing and downloading Mountain Lion.  Can anyone give me simple directions on how to uninstall the OS and revert back to the prior program.  I am not a computer savant!   thanks

Unfortunately, installing a previous version of OS X is not simple. It might be easier to try to address the issues you're having with 10.8 - if you can explain what's happening, we can try to help.
Matt

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