Rear Window was broken have a new one, but how do I replace it?

On the interior, there is a rubber lip surrounding the window. This rubber lip holds the glass in place. Here is how to remove without breaking stuff: Collect about 6 sticks (more is better) that are flat and preferabley made of something a little bendable. The ones I use are plastic and measure 8 inches by 1/4 inch by 1 inch and taper down to a blunt, rounded blade at the end.
From the interior, pull back the rubber lip where it meets the cab... not the glass. Where the lip meets the cab, you jam one of the sticks in place so it holds the rubber lip away from the cab of the truck (towards the glass). Start near a corner. About 4 inches away, do this again. Keep doing this until you have all the sticks in place. I found that doing this around one end of the glass (driver or passenger side) allows me to work that end out and the rest will come out with minimal hassle.
To install:
Place window on stand and wrap rubber gasket around window.
Run a string that is about an 1/8 or 3/16 diameter into the groove that grabs the pinchweld of the cab. The string should be long enough to overlap. Overlap by at least a couple of inches. Tape excess string to interior of window.
Have help to jam the bottom of window INTO the cab opening and try to center as best you can.
While applying LIGHT pressure to outside of window, pull one end of string. What you are watching for is that the rubber lip at least catches the cab pinchweld. If you miss this, you will have to start over. (Sometimes you can save it if you have a hook tool handy. A hook tool is essentially a screwdriver bent sharply at a 90 degree angle.)
If you do it right, as you pull the string, it will pull the rubber lip toward the interior of the truck and it will catch the pinchweld of the window opening. A little messaging and slapping of the window will fully seat the glass.
You are done.

Very easy to do take out from inside the seal u need two people to do it