Stupid remote or stupid user

I am trying to delete my previously “learned” functions for my CD player from one of my input keys (game) on my remote as I have switched to a different input. (SAT). I am following the instructions in the manual but no matter how much I try, it does not delete. I have programmed the new device key successfully and now I want to clear out the old “game” key.

Is it me or the remote?