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Log into the Builder
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Click Build My App
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Locate the tab you wish to create this webpage post within, click Edit
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Click Add Items where you wish to add the webpage within the tab and in the right-sided tab bar that appears click the Website button
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Click on the newly created item and in the right-sided tab bar paste your webpage URL in the Website URL field
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Add a title, thumbnail image, and any other details you wish
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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