Entering Security Code?

I have a ford KA with a 5000RDS.I have the 4 digit code in the hand book and also written on the back of the unit. In the hand book it states enter the 4 digit code using the numbers 1-4 then press SELECT.What button is SELECT as it does not say SELECT on any of the buttons. Does anyone have an idea? I am now on my 6th attemp.