If your Team Site was created by an Organization using TeamSideline for Individual player registration, then contact your League Administrator and ask them to change your Team Name.  They can do this as follows:

1. Sign in
2. From the Schedules group, go to Leagues & Divisions
3. From Leagues & Divisions, go to the 2 Teams page for the Division that has the team (Note: This option is only available for Individual Youth or Adult Registration. For Team Registration, the Team Name must be changed in the Manager's enrollment).
4. Edit the team name, and click save.  The change is automatic/instantaneous.

If you created the Team Site independent of any League, then

1. Sign In
2. click on the Team Name link in the left sidebar
3. click the Edit Team tab
4. Change the name
5. click save