How to fit CCRT700 on Zafira elegnce 2002

Hello everybody I am newbie and wish find help from all respected members, I pought CCRT700 stereo (puilt in telephone) and code is provided Ifited it on my Zafira Elegance 2.0 DTI 2002 it powerd on but nothing on disply to put the code I follow the instructions step by step also nothing on display what can I do to make it work
thanks in advance