if you have fully adjustable hinges you remove cap on the part of hinge that is connected to your sash the adjust with an allen key,if you have butt hinges your door may need toe and healing and i'd recomend you call a double glazing repair company in your area tyo do this for you as it is a tricky job.hope this helps
shaun www.sdwupvcrepair.co.uk, June 2008