How do you put a video into Windows Movie Maker?

So you have your video clip(s) on your movie maker. Now you have to click on the one you want to shorten. Then click on the right side of the clip, and pull it in to the left. Your clip is shorter. Another way to speed it up is to use effects. go to the top of the page, it should say tools somewhere in there, then click on video effects. scroll down and it says speed up double now you sound like a chipmunk!