It is pretty straight forward. It's better used as real time codes never really had luck retrieving stored codes , some say function 1 has stored codes. It's not so user friendly I think when you push buttons sometimes other function appear. To program functions hold CONT button down and turn keyswitch on. It should come with a book , if not I could shoot you an email with a little cheat sheet. I should add you cannot operate unit while in programme mode, just hit escape a few times , then you should be able to operate unit and look for any codes to pop up on display