If your child plays for a team and you wish to receive notification emails you can join any team as a parent/guardian. Often a parent will be added by a team administrator and an email will be sent to you with instructions for next steps. If you do not receive an email invitation, you can request to join a team by clicking the 'join team' link on the far right side of the navigation. Your request must be approved by a team administrator before you are officially a part of the team.
Sometimes parents prefer that their children not to have their own email addresses. You can add your personal email and complete the name as that of your child so that they appear attached correctly to the team roster but all correspondence comes directly to you. Or simply attach yourself as a parent and have your child added to the players roster without an email address attached.
If you have multiple children and only one email address it's recommended you list yourself under the parents section and have your children listed on the player roster without including an email address.