Reference Numbers/Letters in image?

[xronosuf]

On the firstStepsInXimera page there is the following:

This may be easier to follow if there are some kind of pointers, for example we could use a "1" or "A" before the "The ``Serve" Button" and then put the "A" in the appropriate place in the image to make it visually easier to find each piece being referenced in the paragraph and/or the bolded lines at the bottom of the screengrab above.