Help with Fenix AirPad on iPad

I have in the past managed to get the Fenix AirPad working but since then I’ve changed computer and internet provider. Now I can’t seem to get it to work.

I use Windows and a normal iPad. I have Vodafone WiFi here in the UK and have Norton for Gamers on my pc.

I’m not hugely technical so if anyone knows how to set this up and can explain it in easy to follow language I’d be super grateful.