The Nest Thermostat should show up as an entity with a domain of climate. Also, the device specific part of the entity ID, by default, is the name that Nest gives it. E.g., my Nest Thermostat is named Kitchen, so it shows up as climate.kitchen.
I do have another question, when I click on Hass.io my addons won’t load on my laptop screen. In the past if I refreshed the page they would show up but now all the sudden the page reloads but remains blank. Any ideas why this may be happening?