Aleš Lombergar

I`d kinda need a close-up pic of your window frame (the part where the broken pane is/was fitted into) to tell you Exactly how. Can you email me one?

At the risk of oversimplifying, measure the opening where the other glass was. If you still have the glass that came out, you can Sometimes piece it back together on a flat surface good enough to get a good measurement.

Have another pane cut at a glass company or Home Depot using those measurements. Best to take a piece of the broken glass with you to insure they cut the glass you need. I would say it is probably one eighth inch thick but take a piece with you.
The frame *Probably* (need the pic here) has 4 vinyl stops, 2 verticals and 2 horizontals that held the glass in.
These are easily removed and will snap back on when you replace the glass.
Just be sure and mark them with a pencil so you put them back like they came off.
If they are yellowed and/or brittle, replace them. Wherever you get your glass should have them.
Make sure ALL the little bits of glass are gone from the “tracks” where the new glass goes. They Will break the new pane.
Use a soft bristle paintbrush or similar for this.
Don`t press too hard snapping the stops back in or the last snap you hear will be the glass (:>
I like to run a bead of caulk along the flat 1/2 inch(?) surface the inside of the glass rests against. Not Too much `tho or it will smash out on the inside. Not a pretty sight.

Well, guess that`s all the help I can give `til I see a pic.

Good Luck with it! Don`t let it scare you but for God`s sake be careful handling the glass.
I got cuts from here to there when I worked as an apprentice from rookie slips and such. Best to wear rubberized gloves while…..Not the beaded kind.

RT