To join an existing team, the best procedure is to send an e-mail to the captain of the team.
You can also check the Ladder forums, as teams regularly post advertisements looking for new members.
Most teams have requirements and may ask you to play several games to observe your ability. If you aren't accepted onto a team, try others until you are accepted.
No, because each player can only belong to one team on the Ladder at a time. If you are found on two teams you will be removed from both of them and the teams will be penalized.
Captains should always check that new recruits are not members of other teams.
Captains can access the "Add/Remove" tool, which is located in the "Resource" area of the left-hand menu of your Team Ladder's page. The players you want to add must already be registered on the Ladder.
You can view a list of the eligible players by clicking the "Standings" link located under "The Ladder" heading on the left-hand menu of your Team Ladder's page.
If you are the captain of a team, you may edit your team's information by clicking the "Team Editor" link under the "Team Functions" heading on the left-hand menu of your Ladder's page.