How do I adjust my handbrake on Citroen Relay 1.9d 2000?

I have just fitted new shoes to the rear and noticed that the handbrake cable was longer on the near side. When I had the shoes fitted in place the cable was so short that it was operating the handbrake without the lever being raised. The offside is OK but the nearside shoes are binding, turning only about a half turn freely and getting hot and smelly. How do I loosen off the handbrake cable so I can get the cable adjusted equally on both sides and stop the nearside binding. I would appreciate any help. Thanks