I need help with my thermostat

[Shatiera]

I need help with connecting my thermostat 

[David_K]

Assuming you've checked your system is compatible, first check which model of thermostat you have:
Nest thermostat compatibility - Google Nest Help
How to tell which Nest thermostat you have - Google Nest Help

Nest Thermostat
For the Nest Thermostat model, use the Google Home app. The QR code and setup key are physically printed on the back of the thermostat. Follow these steps:
Get started with your Nest Thermostat - Google Nest Help

Nest Thermostat E and Nest Learning Thermostat
For Nest Thermostat E and Nest Learning Thermostat models, use the Nest app. The QR code and setup key are in the settings on the thermostat itself and are not printed on the device. Follow these steps:
Add your Nest thermostat to the Nest app - Google Nest Help