Keyless Entry Problem

I got a 2001 Ford expedition eddie bauer and when i lock the doors the alarm is armed but the problem is when i use the keypad to enter the ruck the alarm goes off before i can een finish the code i need it o stop and also when i unlock or lock the doors the horn chirps and i want that to stop as well PLEASE HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!