I hate to sounds rude, but you aren't even trying. It's located in several parts of this forum. I grabbed this link
for instance from a stickied thread entitled "Start HERE Before Flashing a cooked ROM (Verizon i910), Guide to your first flash: The Verizon CF03 Update ROM and beyond!" I know the next question going to be what do I download and how does this work, so let me save you the trouble. You download CF03 parts 1,2,&3 extract via winrar and it will form one solid file. Then flash that file with UMDL.