My pop-up window does not have an ‘on’ box
in the upper left corner. It has four radio buttons.

Normal Mode

Add Lines

Add Text

Add Circles

I clicked the Add Lines button.

Then it has a rectangle that says

Delete Overlay

I leave that one alone.

In the lower right corner I see a rectangle that

Displays a pink horizontal line. If I click that
I get another pop-up window that allows me to select
a different color. I like that color, so I click OK
for the color and then I click OK for the original
pop-up window in which I selected Add Lines.

Nothing happens.

-Glen