Till now, you performed all necessary steps to send sensor data to Backend Service (i.e. Qubitro) . And you have to verify if sensors created automatically, and if data started to flow. When sensor created, you can view more information on Device and received data. For this, you have to goto Backend Service (Qubitro) page and verify that if the sensor created in the project page or not. Device creation in the project is expected to be done automatically.
If a device did not show, verify that if sensor sent data after Step3. Because device will be created automatically after receiving the sensor data.