Open LIPS (what they call it for short), and... Hang on a sec... Actually, the patch I gave you is its own patching system. But I forgot what it contained ^^'
I think you should make a copy of the Platinum file just in case. What you do is when you extract the patch thing, make sure all the files are in the same folder/section as the Platinum ROM. You then drag the ROM to one of the things (there should be a "how-to" guide included), and work from there.