To share your website or landing page, you will use the link that appears in the grey box on the right-hand side when viewing the page editor after publishing your page.

Note: Pages can only be published when there is a page title. Pages without a page title cannot be published.
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When you first open your website by clicking on Pages, the link to your homepage will appear here.

To copy that link, you can click on the chain link button to the right.