It's a simple procedure of adjusting the circle size of the spot removal tool to being just slightly larger than the spot you want to move. Simply adjust the circle then click on the spot to be removed.
However, have you ever had the circle disappear and only see an X on the screen?
This can be very annoying since the seeing and adjusting the size of the circle is critical in doing the editing.
Here is an example of the problem. Instead of a circle, all I have is a little cross-hair icon.
The problem was, for whatever reason my caps lock key was on. Just turn off the caps lock and the circle needed reappears.
There is another scenario where the missing circle could happen. If my "brush" size in the options panel is too big for my image.
Take a look at the size of my spot healing brush.
No more missing circles!