Add Team Members to Teams
Step 1:
From the left-side panel, hover over the gear icon. Go to the Organization & Users and choose Teams.
Step 2:
Click the Users link button under Teams.
Step 3:
Choose a team member from the user drop-down and click Add.
IMPORTANT:
If you don't have access to this feature, please contact your administrator to add the Team Member to the Team or they can add the permission for you to do so.