Manage teams is the section where you can view and manage your team members and roles. Your rights to manage the team depend on the role that you have been assigned and the license that your organization has purchased. You can access the Manage teams menu from the drop-down menu that opens below your username in the upper right corner (please see images above). The teams and subgroups available for you are shown on the screen. You can change the team's settings by clicking Team settings and navigating to the right tab under which the settings are organized.
You can always see what team you are working in from the upper left corner of the page (see arrow in the image below). If you belong to more than one team, the drop-down menu that opens when you click the team name will also show your most recently visited teams and subgroups, thus enabling you to move easily between them.