Some came with a lock strip in the middle of the molding and some didn't. If it has the lockstrip just find the end and start peeling it out of the channel. The last one I removed did not have the lockstrip, so I just started at the top corner and pushed. A little persuasion with a plastic windshield tool or little screwdriver helps to get it started, but it just pushes out the back. To get it back in do as C-Moore502 said. 550 cord works pretty well, and if you open the slider it lets it flex a little more, and it's easier to hang on to the window.