Felicia radio code

Hi,

I've just put my felicia back on the road after 2 years of SORN; obviously with a new battery which means it's now wanting the radio code to be input. I have no issue with the code, I still have the card you get from new with the code on it, but what I don't have is the input method. When I turn on the ignition it flashes 'safe' and then changes to '1 0000', I can change the 0000 to the correct code but I don't know which button or combination of buttons needed to 'input' that code.

can anyone advise?

Thanks

Tim