You can find team members via the Facebook post - just find IDs of the Team Members posted by other participants to add them to your team.
You want to add a member:
To add a member to your team, you need to click on the corresponding button.
Then insert the contest account number of the chosen member.
After sending a request, you will see the following:
That means that your request is pending, and you should wait until the player accepts the request.
A member requested to join your team:
After a member has sent you a request to join your team, you will see the following:
That means that the request is pending and the player is waiting until you accept the request.
Once you accept the request to join your team you will be able to see the list of the players. You can dismiss the team or remove a team member any moment by clicking on the corresponding button: