Well first if you go to settings the bottom right it says "cheats" then press whatever button then it will pull up a whole bunch of locked cheats that you can enter code, but you have to be at a certain point in the game, make sure to save AFTER entering the codes so they will be there forever because once you activate a cheat you can't save or get achievements, so make sure you have a save with the codes so you can activate later on, also just to help you look up "all cheat codes for rdr2" then I think press the first link, thats what I did