how do i upgrade to lion software

Run the 10.6.8 combo updater, open the Mac App Store, and try purchasing Mountain Lion 10.8. If you get told it's incompatible, choose About this Mac from the Apple menu, check if the computer has at least a Core 2 Duo(not Core Duo) or better CPU with at least 2GB of RAM, and if it does, phone the online Apple Store and order a download code for Lion 10.7.

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If you are still running 10.6.3 like your profile says, then you need to update it by clicking on the Apple in the upper right hand corner, and then click on Update Software. Let it get all the updates that it has and get to 10.6.8. Once it gets there, you will have access to the App Store and you can then do a search in the App Store for OS X Mountain Lion. Once you purchase and download it, you click on install and it will do everything for you.