How to put rollers on shower door track

I just received my shower door rollers for my Manhattan corner angle shower enclosure but realized I don't know how to put the rollers on the track. Each side panel has two screws at the top of them, do I remove those screws and then pull out the top track? I don't want to damage my enclosure and might have to return the parts I ordered if I can't figure this out.

 Thanks.

I have included a picture of the top track. In the picture one of two screws are shown. Do I remove these two screws from each glass panel and then pull out the track after removing the doors?