Getting Tuya Smart set up correctly

[Rowan Sylvester-Bradley]

I have about 20 Tuya Smart radiator actuators (you might call these Thermostatic Radiator Valves). and 6 Tuya Temperature and Humidity Sensors, and I have the Tuya Smart Gateway, and I have the Smart app installed on my Android phone. Can someone give me a blow by blow description for getting all these things to talk to each other? I can't get them to pair properly.

Thank you - Rowan