I would be glad for the opportunity to give you a first hand account of how to rotate an image in Premiere Elements.
But, you put us at a disadvantage by not citing the Premiere Elements version in use or the computer operating system on which it is running.
So, for now I will generalize and later fine tune the reply based on your details.
Assuming Premiere Elements 11, 12, or 13 on Windows 7, 8, or 8.1 64 bit.....
Right click the video on the Expert workspace Timeline, select Rotate 90 Right or Rotate 90 Left from the pop up menu that appears.
Highlight/select your video on the TImeline, go to Applied Effects Tab/Applied Effects Palette/Motion Panel expanded.
Midway down the Motion Panel expanded is the Rotation feature with more options than for Way 1 mentioned above.
We will be watching for your follow up.