Firstly create and name your team by following these steps:  
• Click on 'Users & Teams' on the top black navigation bar  
• Click on the 'teams' tab
• Click the 'Create new' button

• Give your team and name and a colour    
• Click the blue 'Create team' button 

After you click the 'Create team' button you will move to a second page where you need to add your users:
• Drag the people you want to add to the team up to the 'Users on Team' section

Useful links:
How do I give a team specific permissions | Users, Teams, Access and Permissions | What are teams used for and how do they work? | Team Structures and Planning

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