Rear Window Prob. 68 Firebird

[ramen]

Hey

My 1968 firebird has a problem with the rear drivers window. It recently fell of its track and I haven't figured out a way to put it back on. The only place there is enough room to slide the main gide in is all the way at the top, but the rear fender (I think thats what it is called) is blocking it. Any tips /  suggestions for putting the rear window back in?

Oh and I have NO idea how it got off track.

[pupp1]

Look at a manual ramon.I myself have never done one but it should be simple to fix.