After logging into NBA Top Shot for the first time, you'll be prompted to designate your favorite team. If you forgot to do that during the initial signup stage, you have a few paths to getting your favorite team set up.
The first option is to go to your profile, and either click on your profile picture or on the right, click the three dots and select Edit Profile. Alternatively, you can also hover over the Community tab and then click on the Change Team link.
From there, you will see your option to edit your favorite team.
You will be presented with a list of NBA and WNBA teams to select as your new favorite team.
Simply select the team of your choice, hit Save, and your new favorite team will be set.