SODE jetways are listed in the GSX parking selection menu with a "JS" appended to their name. They will be operated while you call Boarding/Deboarding in GSX. Of course, the KMEM manual has an explanation, with screenshots, about the procedure.
If you don't see the jetway selection menu when Boarding/Deboarding, and the jetway IS a SODE jetway, you are probably parked in the wrong position, so SODE couldn't solve the jetway animation but, in this case, you'll see a warning "No jetway can operate a this position" from GSX.
