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Dear Sir or Madam.
I understand how to fit the OrangeRX DSMX/DSM2/Devo Compatible 2.4GHz Selectable Transmitter Module (JR/Turnigy Compatible).
How do I get it to work on my FrSky Horus S12s Transmitter
You need to disable the internal RF and enable the 'external' RF module in the Horus firmware.
If you are using the standard FROS firmware on your Horus, see here on PAGE 21:
Thank you my friend. Sorry to be such a novice at these things.
I guess like my landings NOT GOOD expensive to say the least. Ha Ha!!! My local hobby shop is getting very rich.