PILOTS
(1) Set AIRLINE CALLSIGN to NONE and make sure you have a Valid Callsign in the Tailnumber field.
This will be the Name that ATC calls you.
(2) ALWAYS select a GATE to start at.
If you do not, the DEFAULT is to spawn on the Active Runway, and the FSMP will then KICK you from the session.
CONTROLLERS and OBSERVERS
All you need to is select the CORRECT Airport that you are going to control at.
(It may NOT necessarily be the Session Default Airport)
However, once you join, you MUST immediately REGISTER your ATC position with the server.
DO NOT start controlling until you have done this. ( See CONTROLLER SECTION on this website)