After linking your Hub over Bluetooth in the Airthings App you will see your Hub at the top of the screen under Settings then selecting Devices.
The Airthings Hub will not show in the Devices main tab in the bottom left-hand corner because it is not an Airthings monitor or air purifier displaying information about your air quality.
If you don't see your Airthings Hub at the top of your screen, try closing out the Airthings App and reopening it to see if it now appears. If you do not see it, try adding it once more by selecting the + Add button at the top right of the app.
If you're still having trouble connecting your Hub to your account, simply chat with us directly from the Airthings App under the support function or write us at support@airthings.com and we'll get back to you as soon as possible.