The quickest way to register to a team to an event is to register as team lead
For that you will need only
- the name of the team
- an email address with an inbox which you can access to click the email confirmation link
This will be enough for the team registration, and the more detailed player information needed.
For screenshots on the steps, check this article
Note: The availability of this feature is subject to the settings set by the event organizer. In some cases, the organizer may require for the full team to register.