Pre-requisite:
The coach you are going to add needs to have a Nettla account and exist in your admin player list. If they do not already exist in your admin player list, go to Players -> Player list -> Add player and invite them through that feature.
Creating the coach profile:
Go to Play -> Private Coaching -> Add coach
On "Find Nettla user" = Search for the coach's name in your player list.
Show online = Means that the coach with bio is displayed to your players
Toggle off the "Available for private coaching" option
You do not need to fill out anything else at this point -> Save