Playing with v13 AFM I noticed that when creating rule via inline editor I am not able to set any value for Source and following fields. To do that I had to turn off inline editor.
I wonder if this is bug or incompatibility with used browser or it should be like that. I used Chrome 57.
OK, I just solved the puzzle. Add button for Source or Destination becomes active after entering anything in the respective field. I was miss leaded by graying this area especially because I tried to set regions and there was no controls available to specify type of source. Turns out that entering country name gives choices from geolocation - easy like that 🙂