Firstly switch on the radio. You should see _ _ _ _ (or Code _ _ _ _). Press 1 repeatedly for the first digit of your radio code. Press 2 repeatedly for the second digit of your radio code. Press 3 repeatedly for the third digit of your radio code. Press 4 repeatedly for the fourth digit of your radio code. Once your radio code is showing on the display, you need to save it. To do this press and hold the number 5 button until you hear a beep.