I followed the steps EXACTLY as described. When I go to use the"move" tool, it will slide the layered image all around but there are no 'handles' or "grid" view to "grab" and flip the portion of the image I am trying to flip. Please advise. Have tried multiple ways of doing it and nothing is working. Trying to flip a lensball image.
Further to the post by Greg S above, in step #4, try the transform tool instead. With Layer 1 active, press CTRL+T. Hover the cursor a tad outside the bounding box and you should see the arrow to flip. Confirm with the checkmark when ready.