ClarisImpact will not allow you to use the Free Rotate command on bitmap graphics. While the menu option for Rotate can be chosen, ClarisImpact will beep at you when you try to rotate a bitmap graphic that has been Pasted or Placed. Bitmap graphic formats include Paint and TIFF images on the Macintosh.
However, you can use Transform options on your inserted bitmap graphics. Rotate 90 degrees, Flip Horizontal and Flip Vertical all work well, if you do not need to rotate in single degree increments.
If you need to rotate a bitmap graphic in increments less than 90 degrees, rotate the bitmap in another program like ClarisDraw or BrushStrokes, then bring it back into ClarisImpact using Copy and Paste or Insert.