As a team owner, you can add manage team settings.
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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Add or 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.
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Enable @channel or @[channel name] mentions.
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Set permissions for guests.
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Enable team members to send GIFs, emoji, and stickers.