kenmullins Ah, OK, I think I understand now. So program just does not know the coordinates of the location that you are looking for, that is why it cannot add those coordinates to your photo. It cannot just add text string “Texas”, it needs exact GPS location. That is why the button is not enabled.
What you can do instead is to find coordinates of the place in Google Maps, and then copy and paste it into this dialog instead of the name of the place. This way you can add arbitrary location to your photo, apart from ones in the list. More about this function here: https://community.tonfotos.com/d/158-version-1311-editing-the-photo-location