Ok can I download it and do it over the phone or do I have to use a computer? I tried doing it and it didn't work I very new at this so I don't know alot.
Download it to your computer. Plug your phone in and mount it as a disk drive. Copy the file to the root directory of your SD card.
This is where it gets tricky with me helping you...I'm doing it from memory, which in my case isn't usually a good thing. I also have Clockwork Mod's recovery on my phone, so I can't bring it up to look.
Boot into hboot...power and volume down buttons at the same time. When hboot is done peeking at your sd card, use your volume button to highlight "recovery," then hit the power button. When you get the triangle screen, hit the up volume button and the power button at the same time to get into recovery.
This step is important. I don't know the exact verbage, but you want to wipe the data/factory reset, then wipe the cache partition. Use the volume button to highlight your selection, then power button to select.
When you're done wiping, select something along the lines of "install zip from sdcard." When the phone's done it's thing, it will be back to that minty fresh installation that was on your phone when you bought it.