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Goal: an “Subscribe” box on your page that adds people to your real mailing list.
1

Pick your email tool

Mailchimp, ConvertKit, Beehiiv, or Substack all have free tiers and a hosted signup form.
2

Create a signup form and copy its embed

In your tool, make a signup form / landing form and choose Embed. You’ll get an <iframe> (or a small script + form) snippet.
3

Add it and publish

Tell your AI “add this newsletter signup to my page” and paste the snippet — or drop it into your HTML. Subscribers flow straight into your list; Shareable just shows the form.
Want it to match your page perfectly? ConvertKit and Mailchimp also give you a form action URL you can use with a plain <input> + <button> — ask your AI to style a native signup that posts to it.