At the moment, users cannot create multiple coaches accounts for the same team, or change team ownership (i.e. coach privileges) from one account to another. This is a feature we are working on, and it will be available in the near future.
In the case of a new person taking over the coach position, you can change the information (including name, email address and password) of the current coach’s account, to the credentials of the new one.
If you do need multiple coaches for your team or need to transfer ownership, please ask the new coach to create an account and join the team; then, contact firstname.lastname@example.org with their information and we will make the necessary changes.