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Log into the Builder
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Click Build
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Locate the tab you wish to add the custom group to and click the Add Group button
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In the right-sided tab bar that appears click Create New Group button
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The new group will then be added to your tab. Simply drag and drop to move this wherever you want
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Now the fun part, add your web-platform content to this group or create custom content inside the Builder
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Click Save and Publish to Preview to test your new app changes. Then, once your changes are ready to go live to all users click Publish to Live