Log into the Xeelo environment (i.e. https://dev-mobile.xeelo.net).
Proceed to your user profile details by clicking on your user name in the top right corner - My profile.
On the right side of a page choose Mobile Devices.
Click on Add for adding a new device. The QR Code is generated.
After download and an installation of Xeelo Mobile App, follow the displayed steps to the state where the QR Code is required.
Scan this code via Xeelo Mobile App on your device.
Congratulations! Your user profile is now linked to the mobile app on your device and all settings and tasks are synchronised.