Now that you have a user account, you must register your device to that user account. A device can be registered to only one user account at a time.

To Register a device:

Go to the My Devices tab
Make sure your Purpl PRO is powered on.
To Register the device, tap the "Register" button on the right
Activate the device for measurement by tapping the toggle switch to the left of the device serial number.
If this is your first time using the device, you will be prompted to Calibrate your Purpl PRO.