You must have "Full Access" or "Limited Access - Website" permissions to edit your site.
NOTE: You will first need to create your scoreboard ribbon. A solo Team Page is a team page that does not belong to a Club Page or a League Page.
Sign in and turn on Edit Mode.
Go to the Team Page you want to add to the Scoreboard Ribbon.
Click on the Admin dropdown arrow.
Choose Edit Team.
Check the box next to Show Scoreboard.
Click Save Team.