How configure NV Access to work with YouTube?

I'm an IT person, trying to help one of my customer's who has macular degeneration. He used to use MS's Narrator. Specifically, he was able to right-click on Youtube subheadings to read them, or click a blank spot to get it to stop reading so he can hear a videeo, but then they changed their whole configuration scheme.

Does anybody know how to configure NV Access so that it requires the user to tell it to read something, not read it automatically?

If there is a better place I should be posting this question, please let me know.

Thank you.