The code should be somewhere in the info pack (handbook). It will be a 4 digit code.
When you do get it, you enter the code into the radio thus:-
Press the '1' button the number of times for the first code number. If the code starts with 3 you press the 1 button 3 times.
Use the '2' button for the next number, '3' for third and '4' for fourth.
The radio should then acknowledge the code and should operate.