You need the code for the radio. When you have the code, you use the bottom button on the steering column stalk to select the number you want to change and the 'channel selector' roller to change the number.
A more detailed explanation can be found in the handbook, which is where they usually put the radio code. If you don't have the code, you should be able to get it from Renault. Or check the local car mag for a 're-code' expert.
Hope this helps
Patsy
November 2009