Hi, out there! You are just a number?
Ok, let's see how we can cope with your problem!
I have just linked a WST-7 EasyControl to a FASST-compatible RX and before switching the configuration on I put a bind-plug (connetcting minus to the signal) onto the MSB-port. And within almost no time the WST has recognized the S-BUS-signal and linked itself to the RX and the commands from the TX were lead from the FASST-RX via a linkcable to the WST-7. All the four servos were only connected to the WST-7. So far so good.
Before starting the initialising-procedure make you RX controling one servo-excit that is not used on your plane. You can use the highst possible channel on your TX the signal of which is lead through the S-BUS and lead to the WST. The WST recognizes any channel from 1 to 16, even if it is only a WST 7, 9 or 12. I think for Futaba channel 17 and 18 are also possible - see the manual for that, I am not a Futaba expert.
Leave the slider for the sensitivity channel to one end and push it to the other and leave it there when the procedure asks for the sensitivity channel.
Leave the bind-plug in place and start the teach-in-procedure as recommended on the spicker-card. When you have finished the procedure successfully switch off the complete RX-unit and restart it again without the bind-plug. If there is a red blinking LED on the WST you have made a mistake in the teach-in-procedure and you have to start over gain.
I hope I could help you a little bit to calm you down.
so long
profimc