Switch on the stereo (CODE IN appears), enter the code using the PRESET buttons (1 - 6), i.e., if the first number is a 2, press 2 on the PRESET button panel, and so on. each time you press the button, the corresponding number will appear on the display (if your display works; if the display is dodgy, pressing the display surround sometimes works!)
on ares u have to press 1 then use tha arrows to select the number then pres 1 agen untill u have entered the code and then the code will work then the radio will just start