Hi, when you switch the radio on and it asks for the code, you use the station channel selection buttons in turn to enter the code (Buttons 1 - 4) then enter it by pressing button 5. If you cannot enter these numbers because the wrong numbers have been entered too many time you will have to get the radio reset, some people say you can put the radio in the freezer for a period of time and this will reset it but a guy told me a while ago a way of doing it which worked for me, this was switch the ignition on and leave the car for around half an hour or so, this reset the radio on my Ford Escort. Once reset you can then enter the code and off you go... Hope this helps..Al