Add members
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In the teams list, go to the team name and select More options > Add members.
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Type in the name or email address of someone you want to add.
Note: If the person is outside of your organization, type in their email address. Select the pencil icon to add a display name everyone will recognize. The guest will receive an email inviting them to join the team.
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Select Add.
Remove members
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In the teams list, go to the team name and select More options > Manage team.
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Under Members, select the X to the far right of the name of the person you'd like to remove.
Add team owners
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In the teams list, go to the team name and select More options > Manage team.
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In the Members tab, under Role, select the down arrow and change Member to Owner.
Watch the video:
https://support.microsoft.com/en-us/office/go-to-guide-for-team-owners-92d238e6-0ae2-447e-af90-40b1052c4547