Go to the settings page for the module and select which module it will be populating with the feeds. The Categories associated with that module will then appear when you try to add a feed. Currently, this module can integrate with one of the following (Modzzz News, Modzz Articles or UNA Posts)
I just bought this module. When I choose "posts" and try to create an RSS I still have the error of empty categories (as posts has no categories)...how to fix this?
