Hi there and welcome
What you need to do is pair this one with your Smartphone just like you did with your original Vivofit.
I have a film for you which you can follow to do this, and it is available here
Follow the first video about pairing then you can review the get started video to take you through the functions of the unit.
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.