Welcome to the Hubitat community.
For things like the T6, you likely need a community based driver. If it is cloud based, like this T6, often times it isn't natively supported in Hubitat built-in drivers.
There appear to be a few versions of drivers for that device. This thread [RELEASE] Beta 1 - version of Honeywell Home Thermostats (Lyric etc...) is probably a good place to start reading. I don't have one of these, so I don't know which of the drivers works best but it seems like the Window Washer code is popular in that thread.
Maybe a more generic question would be are you having trouble installing community based drivers and apps, and/or are you having issues configuring things?
Those should be fairly straightforward if you follow the documentation.
Have you tried these steps?
