1.  Log in and get in edit mode
2.  Go to your team page
3.  Look for Admin Tab, It has a pull down menu, select >options.
4.  > Edit team:  
5.  Change Team name.  Name= Header on Team Page, Short Name= Left Column menu.
6.  In same menu you can Add Logo and change your team colors.

Please note to find options it's now under the ADMIN tab:  Drop down is Options>Permissions>Groups