If your hand brake is to loose you need to adjust your rear brakes as that is the problem. There is no adjustment for the hand brake. You may need new brake shoes on the rear.
How Do I Adjust The Handbrake On My 1994 Ford Escort?
The brake adjusters on the rear shoes are a common fault for failing they will need changing the adjusters can only be bought from your local ford dealers and they cost 75 quid not cheap for 2 adjusters