1994 Nissan Altima rear driver's side door window

Remove the door panel. Wined down the window. You well see a retaining bolt that holds the glass and frame to the window regulator. Remove the inner and outer door moldings (the bottom weather strips) unbolt the old window and remove it. Carefully install the new glass (you may have to remove the rubber window track depends how good u are at it) line it up to the bolt and bolt it down. Install the moldings and install door panel.

Now if your talking about the triangle window. You follow the steps above but after removing the glass for the window motor, you will unbolt the retaining bar from the top under the weatherstrip, aswell as the bolt under the door panel. Clean busted glass out and carefully move retaining bar out of your way. Put in new glass and bolt retaining bar back into place. And continue withe steps from above.