There are currently two editors that are available on WordPress, the "Classic Editor" and the "Gutenberg Editor". These instructions are for the Classic Editor. You'll find instructions for the Gutenberg Editor here.
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Add a link to WordPress
To add a link directly to a product from your WordPress site, all you need is the right URL to use. Finding the URL for your product is easy - just click on Products at the top of your admin dashboard, then find the product that you’d like to promote and select to Share / Embed.
A modal will appear showing your product URL, which you can copy and paste into your WordPress site wherever you need it.
You can also use your store URL to link directly to your store home page from WordPress. To find this URL, navigate to Account > Settings and scroll down to Username.