As a team owner, you can add new members and guests, change members into owners, manage channels and settings, and archive a team that's no longer in use.
Add members
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In the teams list, go to the team name and select More options
> Add members. -
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. -
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. -
In the Members tab, under Role, select the down arrow and change Member to Owner.
Manage channels
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Go to the team name and select More options
> Manage team. -
In the Channels tab, select Auto-favorite for any channels you want to make sure show up in everyone's channel list.
Note: You can favorite up to 10 channels for your team.
Change team settings
Go to the team name and select More options > Manage team. From there, you can access your team Settings tab, which lets you:
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Change the team picture.
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Set member permissions (like allowing them to create, update, or delete channels and tabs).
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Enable @team or @[team name] mentions in a channel.
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Set permissions for guests.
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Enable team members to send GIFs, emoji, and stickers.
Manage and add Apps
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Go to the team name and select More options
> Manage team. -
In the Apps tab, you can manage the apps your team uses.
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Select Go to store to find and install a new app.
Archive a team
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Select the manage icon
at the bottom of the teams list. -
Select More options
on the far right of the team name. -
Select Archive Team.
Source: Microsoft