I added an Action from a template and it is now on the main page of my App but I want it on a Subpage. How do I move it?

First, remember the Actions name.

Then, delete it from its current position using the trash can icon (it will still be in your Library).

Now go to the Subpage where you want to use teh Action and use the [+ Existing Actions] option to add the Action to that Subpage. If you don't see it right off in the Library, search for it by Name.