Turnigy Flush 30A bluetooth Connection

anyone could help me where is the signal wire located in Turnigy Flush 30A. And also Can i have a full picture of the circuit diagram, i dont understand where the signal wire came from and how to connect the 2k ohms resistor. Im using turnigy flush 30A. See the picture below.

https://drive.google.com/open?id=1c1GJAMvPTzgE_onJogQYk1Jqob1_wNb5
-Picture of Turnigy flush30A

  • Circuit Diagram

reffered video

(idont understand well the connection of 2k ohms and 1k ohms then where the signal wire came from)

or anyone suggestion for bluetooth controls of my Turnigy Flush 30A?