How to use      
 

1.

 
2.
 
  Insert the label (with name and phone number
pointing downwards) behind the little window...
  ...until it is hold in place by the two plastic lines.  
 
 
  3.  
4.
 
  Close the bracelet around the wrist and insert 
the end under the little 'bridge'....
 

...and then through the hole of the arrow 
of picture 3.