To grant a team member access to Radar and enable them to view analytics, they will need to have a Portal account and be assigned to the stations you want to give them access to.
For users only requiring access to Radar, you can create an Analytics user that will be redirected to Radar on login to Portal.
To learn how to create a new user on Portal and assign the user to a station, please head to this helpful article: How to Add a New User in Portal.
Only Account Admins can create new users on Portal.