How do I rotate a video 90 degrees with premiere elements 9?

As Steve says, Rotation with Video, is not so straightforward.

If you oriented the camera on its side, to get more of the image, then I would recommend that after you Rotate the Video, that you Scale it to fit perfectly within the Frame Size. This will result in Pillar Boxing, with black bars on the sides, as with Video, you have a horizontal Aspect Ratio.

If this was just due to the mechanical need to mount the camera sideways, or due to an error, then one could Rotate, then just Scale Up and effective crop the top, or bottom, or both with the Project's Frame Size.

This is often done when taping actors for bluescreen work, but in that case, one is going to eliminate the bluescreen background anyway, and Key the material into a horizontal Video background, so the end result is different, than what you have.

Now, one artistic treatment would be to Rotate, and then use your footage as a PiP, inside of a larger image. Though it was written for doing this with stills in a Video, look at this ARTICLE for some ideas on how this might be used with your footage. The actual application of those techniques will ONLY be limited by your imagination. Hope that it gives you some good ideas.

Good luck,

Hunt

Unlike when you shoot a photo this way, rotating a video is a lot more complicated. In fact, you may actually lose some of the video because when you rotate the video the video frame remains the same. You also can't just save the rotated video, as you could with a photo.

To rotate your video, place it on the timeline, right-click on it and select Rotate.

To output a permanently rotated version of your video, use Share/Computer/AVI and select the DV preset.