Do the following
Go to your Google Account Dashboard
Click Manage Account
Scroll to the bottom of the page and click "Go To Web History"
Turn on Web History.
After this, when you do searches, Google will gather your search data in your account and start populating Cards in Google Now. This means you'll start seeing your favorite sports teams and you will also be able to edit them. The reason the edit teams is greyed out for you is you don't have any teams. When you do searches, it will populate that field and you can then edit them to remove ones you don't want.
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