Following are the steps for adding an Opinion Stage item to your site:

To get the embed code, click on the Share button. From the dialog that is displayed, go to the “Squarespace” tab and click on the "Copy code" button.

Start by determining if you would like to add the item to an existing page or to a new one. Click the EDIT button on the page you'd like to modify.
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If you want to insert a new section, click the ADD SECTION button and choose 'Add a blank section':
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In a new section or any existing one, choose the ADD BLOCK option and choose Code:

Paste the embed code you copied in step #1 above:
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Click the save action on the top left.

That's it!