How to patch

[Megalexxx]

It's a stupid question. ;P

No, there's no stupid question on this forum.
To patch a game, you need :
1) the game (more often, a CDI, ISO or BIN file that is your game's image)
2) a patch to apply to your image (a PPF file)
3) a patcher (PPF-O-Matic or any applier).

You can find 2) and 3) on DC Copy World.

To use PPF-O-Matic just run it, select your image, your patch and click on "apply".