To scan a QR code, open the camera app on the iOS or Android device that you use to access the Mettle app and scan the code.
​
Hold your device so that the QR code is clearly visible on the screen. Your device should recognise the QR code and send you a notification.

From there, just tap on the notification to open Mettle and approve access.

If you don't have a Mettle account, you can get one at mettle.co.uk
​