Once registered, you have to pair your device (trainer, Bike, heart rate monitor, etc.) with the Simulator. To do so, the first time you open it, the following screen will be shown, with the two communication technologies that you can use, ANT + and Bluetooth, shown as activated or deactivated in the upper right.
In the upper right you will see the two communication technologies you can use to pair your device. The rotating arrow around them means that the Simulator is scanning for devices through them. It is perfectly normal for the Simulator to try to find a trainer or Bike via Bluetooth and ANT+ at the same time.
When the Simulator finds your trainer or Bike, it will appear as connected.
Once your trainer or Bike is paired, you are taken to the final pairing screen. If you pedal, you will see how the values of power, cadence, speed, etc. change. That indicates that the trainer or Bike is properly paired. You can now choose the session you want to ride.
Remember that you can always open the Simulator pairing menus from the main screen