Setup 6 position flight mode on an HK orange TX

I have an APM 2.6 that I want to use with an HK orange 6 channel transmitter ( I know, not the best TX, but for this project I am limited) It has a 3 position switch (flap/gyro), I just need to mix to get 6 flight modes. . I have seen documentation on how to do this on almost every other transmitter but not this one. Anybody done it? Is it similar to any other transmitter so I can get a hint on how to start. I haven’t had much luck on my own

Thanks