In Webex App, if you're a moderator in a space, you can add others to the space, remove people, edit the space, and assign others as moderators. Keep in mind that even if you've created the space, you're not a moderator unless you chose to moderate the space from the space settings.
Go to Messaging
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Select the space, then go to the activity menu
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Select the space, then go to the activity menu
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Select the space, then click People. Click More
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