ONLY JOKING!!!
Copy all contents found in the zip of CDecrypt into the folder holding your downloaded/ripped game data should be a folder witha bunch of .app and .h3 files
Shift-Right Click in the folder and click "Open Command Window Here" or you can open CMD yourself and cd into this directory/folder
type out "CDecrypt_v2.0b.exe title.tmd title.tik" without the quotes and hit enter
Voila you should have the "code" "content" and "meta" folders.