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You can drag and drop the Modular Content module on single pages created with the Editor too.
3. Creating new Modular Content
Once the slots are set up and configured in your bases, you can create more Modular Content pieces. simply click the + Create button top-left of your pages list and then select the Modular Content on the list below your page name:
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Once you are done creating its content, click the Edit entities & Publish button top-right to assign your new content to a slot (and specific pages if needed).
You can update Modular Content any time and the changes will be automatically reflected on all pages this content is set to appear on.