So I bought the GE In Wall Smart Toggle Switch and I ran into a old wiring design.
So you have a old switched line that has a black, white and ground.
Don’t worry I can help you.
First you need to find out if the white is your load or the black is and the best way to do that is use a voltage tester and test from the ground to each white and black. The line that tested with 120 is your line (E). The other will be your line will be your load (D).
Now your neutral… if you don’t have a white neutral but you have a ground you can use that short 1 wire jumper from your ground screw and jump it to (G).
This will complete your wiring and will now work correctly. All 4 requirements are fulfilled.
Now switch the breaker back on and include it in your SmartThings hub.
Disclaimer: my house is very old and the electrical was done much differently. They you will know is when you remove the switch cover and pull out the switch and all you see is 1 cable with 3 wires, white, black and ground. They don’t do it that way anymore.
If you have more then 1 line coming into the switch box do not follow this HOWTO.