How do I make users use a certain theme?
I think you can only make them use the default theme, but they are able to change in the UserCP. To do that you go to AdminCP, Themes, Modify / Delete, and mark the one you want as default.
I thought I remembered an option that made the defalt over write the selected...
That option only applies for setting a specific theme to a forum.. There is currently no way to force users to use a certain theme over the whole board..
Thank you Chris Boulton and marcgo15.