Stuck with Salus IT500 replacement and another thermostat

Options
Just bought the wireless starter to replace my Salus IT500.
Can anybody help me with installation please.
I use it via the app or black coloured wireless Salus control.
Picture are attached.
Other thing I have seen is an wired thermostat in the kitchen (that could be a seperate underfloor heating thermostat but not sure)
When I added it on Tado app, it says technical team will get to me in 2-3 days.
Help please

https://ibb.co/LtBnTGj
https://ibb.co/FwQrPCy
https://ibb.co/xDb9NBy
https://ibb.co/tX7PD5J