how to lock all doors from inside just by locking drivers door on focus?

i had to take the battery out to do some work on the engine and when i put it back in ive found out that when i lock drivers door from the inside the other doors wont lock.and also found out that when i go to lock the car with remote one rear door will not lock unless i use the double lock and then it will lock.ive got a focus 2ltr ghia year 2001