I checked out the board. It can take a Core2, but remember Core2 runs better on P35 and P45 chipsets, 945 is a bit last generation and looking on Intel's website, the number of Core2's supported are only bottom of the range:
You'll likely also need to do a BIOS update before changing the processor.
I'd also recommend a friend who's done a CPU change before helps. If the heatsink isn't installed correctly you can have all kinds of trouble.
(Personally I'd just buy a new motherboard, even a cheap G31 board will outperform that 945 intel, keep that in mind unless you're being given a CPU)
As I stated in your other thread, your processor won't work on that board.
Otherwise, flash your BIOS to the version that supports your new processor first, shut down, then remove the heatsink, take the old processor out.
Insert the new processor, reinstall the heatsink, and boot.
That is all there is to it.
Be sure you install the heatsink correctly using the proper amount of thermal paste.