Press any button, then enter the Master Code followed by the ‘#’
Select the ‘3’ button followed by the ‘#’.
Select the ‘1’ button followed by the ‘#’.
Enter the slot number for the fob followed by the ‘#’.
Push both unlock buttons on the key fob.
Press the ‘#’ button to confirm.
Press the ‘#’ button to finish.
For further information please see the installation guide found here https://www.yale.co.uk/en/yale/couk/productsdb/smart-locks/Keyfree-Connected-Smart-Lock/