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I have the cheapo trailer windows with the metal flange that bolts around the perimeter on the interior wall. I cut some molding to put around the window but not sure how to attach it..I cant nail it because i would have to nail through the metal flange..any ideas?

Construction adhesive. Check the glue section at Home Depo etc.

ok but how do i hold it up there while the adhesive dries?

If you do use construction adhesive you can just use blue painters tape to hold it in place until it dries. How are you going to deal with the "button" looking caps on the metal trim? Won't they prevent you from attaching new trim?

If I use adhesive, how can I ever remove it if I ever need to remove the window again?

A knife. Just slip it under the edge of the trim and cut the adhesive. Any knife will do, I use a knife with a flat edge that I sharpen with a stone once in a while. A serrated edged knife would work too.

Remove the hex head screws and replace with flat head. I'm pretty sure I used drywall screws.
I had no problem nailing mine on, but the construction adhesive would work fine also.

If you want to nail it just pre drill threw the trim and the metal of the window. Just a size smaller then the nail you will use.