Note: You must be a team owner to add a member. For info on adding or changing team owners, see Make someone a team owner.
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On the left, select Teams.
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Select the ellipsis (...) next to the team in the list and select Add member.
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Enter the name of the person to add. Repeat this step to select more members.
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Once you're done selecting members, select Add.
Note: A member has access to all public channels. To join a private channel, select the private channel and repeat from step 2.