Cannot add custom image/icon

For the life of me, I cannot figure out how to add a custom image I have for the icon. I even found an old topic on it here and that does not work.

In the settings under Basic, I set the style to image and saved.

Under Icon Settings, there are a number of options there. But none of them (that I can see) are for selecting the actual image I want to use.

I checked all of the other tabs to and nothing that I can see.

What am I missing?

Thanks for the help.