hi u will need to lift the door up and off. it will be heavy as u have the glass in the door so two people would be good. then remove the wheels of the door. refit the door then adjust the sliders up and that should do the trick. heres a you tube video watch this as it will help.
http://www.youtube.com/watch?v=Sl07cCuOdqQ
kash
February 2013