When I go into the Schedule Editor and I want to add a theme to the scripture I am working on, I click on the theme icon and select more themes but none of my themes are available. Any ideas? I am running the version 6 build 3.0

Kevin,
I want to make sure you have themes in the theme tab in the scriptures area.
Please verify that.
Also make sure that you are not in an empty collection in the themes dropdown.
Also make sure the search box in more themes is empty.
Looks like clicking more themes is making it disappear, so for now just hover your mouse over more themes.