How to add an athlete to Flow for Coach
You can invite new athletes to your Coach account from the Athletes tab. You'll also see all of your athletes and to which group they belong to, as well as the althletes you've invited.
Go to Athletes tab and under Invite athletes title you can enter your athlete’s Polar Flow account email address to send the invite to.
The athlete can find and accept the invite in their Flow notifications in the Flow web service and in their email.
The athletes you have invited are listed on the bottom of the Athletes page.