Fix driver side window on a 1993 Jeep Grand Cherokee?

My window on the driver side window has come out of the thing that pushes the window up and down. I have the door panel off and I noticed that all I have to do is push the glass back into the slot. But i am scared if I push too hard that I might chip the glass. Is there an easier way to do this? I noticed there are some screws on the pulley, do I need to un tighten those to be able to loosen it so I can put the glass back in?
 
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