I'm trying to make a video of some game footage from a softball game. Apparently my husband turned the camera when filming some of the shots so some are regular and some you have to turn your head to see on the screen. I need to rotate those video shots 90 degrees to the left, but the "Rotate Left" and Rotate right" buttons aren't highlighted or available to click on. 

How can I rotate my videos so the whole movie turns out right-side up? Thanks