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Log into the Builder
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Click Build
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On the app tab you wish to add the custom item to, click the Add Items button
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In the right-sided tab bar that appears click the Post button
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The new item 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 resources to this item or write a description
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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 apps