To change the name of your team and other team related settings, first go to your dashboard and click on your user avatar in the upper right corner of the screen. In the dropdown menu that opens, select My Account.
Scroll down to the Team area and select Settings. Here you can change the name of your team. You can also select what kind of people may access your MindMeister mind maps.
To see more team settings (such as team logo and domain), you can use the product switcher in the top left to switch to MindMeister. Learn more here.