If you're looking at your oil filter pad with the block upside down there is a valve on the flat surface next to the nipple that the oil filter threads on to. That is the one that gets changed, or you can block it off with a steel core plug. It's easy to pry out with a screw driver and the new valve or plug just presses in. Next you need to unscrew the nipple the filter mounts to by using a large allen/hex wrench and under neath it you'll see the other valve. Use a long bolt, I think maybe 3/8?, it's been a while. Anyway with a couple taps you'll be able to thread the bolt in enough to use it to pry out the valve. Reinstall your filter mounting nipple and you're done.