When you sign up for Detectify a team will be created for you. The default name of the team will be "My Team". To rename your team, navigate to the Team Settings by clicking on the blue avatar in the bottom left corner of your dashboard, which will display your name together with #My Team. Select "Account Settings" and navigate to the Team tab.
Rename your team in the field titled Team Name
Click "Save". You'll now see that the name appearing next to the blue avatar in the bottom left corner of your dashboard has been changed to the name you selected.