I dont know what is wrong with it or something may be missing? i cannot add things to the address book!i cant change background settings!cant use the search by address!i dk what may be wrong with it??

Try a full level 4 reset ...

YOU NEED TO SET THE PARKING BRAKE if you wired the unit according to the owner's manual. If you did the 2 wirebypass, then it is not done correctly, or you need the software update.