Radio Code Entry for a '95 Accent

My radio was recently disconnected whilst repair work was being done, and thus, the radio needs a code entry. I obtained my code from www.hyundaidealer.com/decode and I presume this is correct. however, i dont know the procedure for entering the code and my attempts thus far have proved fruitless....

I'd be grateful if anyone can tell me the procedure to entering the code from starting the ignition.....thanks