Taken from the manual to help.
Entering the code ( after a break in the power supply - i.e. bat disconnect )
1. Press the POWER key to switch on the set CODE and 0000 will appear on the display
2. Adjust the flashing digit with the thumbwheel on the steering wheel stalk control
3. Press the key on the underside of the steering wheel stalk to confirm the digit and move to the next.
4. Press this same key again when complete until you hear a bleep to validate the code.
The very first time you enter the security code the radio parameters have to be set. The radio will display "OTHERS".
With < > or thumbwheel you can display the geographical area OTHERS, AMERICA, JAPAN, ASIA, ARABIA
Selecting the correct area will automatically adjust the AM & FM frequency ranges of the tuner. The confirm your choice a long press on the (5) key of the radio or the underside button of the thumbwheel will sort it.
The next settings refer to the car type and alter the rating of the output you make your choice and confirm as before..
0 = Off
1 = Twingo
2 = Clio
3 = Megane
4 = Laguna
5 = Safrane / Espace
As with a lot of stereos if you get the security code wrong you have to wait from 1 to 2 to 4 to 8 to 16 to 32 minutes each time to make a mistake so be careful and make sure you have the correct key code for your car before you buy it.
Not sure if keycodes are available from Renault if you give them your car details ?