Add a Facebook Share Button

Select the text or button you want to use as the share button.
Example of adding a button: Left panel [Add] tab > [Parts] tab > Buttons [Show all]

Open the [Settings] tab in the right panel.
If the right panel is closed, please open it.
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In the [Link] field, enter a URL in the following format: https://www.facebook.com/sharer/sharer.php?u=[paste the URL of the page you want to share here]
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Update your site. Your changes won't appear until you update.
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Click the link in the preview or on your published page to confirm the share button works.