How can I convert my Mac OS X 10.6.8 to Mac OS X 10.8 or better please?

Please could you tell us what Mac you have to so that we can advise.

If you go to the Apple Menu>About this Mac it'll say which model you have. Post back with that information and I'm sure someone will be able to offer some advice.

Get more information about your computer. Go to the Apple in the upper left corner of any window, then "About This Mac". Write down what it says about "version"and report that here. Now continue to "More Info..." Copy and paste the information here, but omit the serial number and Hardware UUID (if present).

"Or better"? Some might say revert from 10.8 to 10.6.8 😀