Insert the following markup somewhere in your theme:

<form action="/mailing-list" method="POST" id="email_sign_up">
  <input type="hidden" name="authenticity_token" value={{csrf_token}} />
  <input type="text" name="email" placeholder="Enter your email address">
  <button type="submit">Sign Up</button>
</form>

We recommend wrapping it in a snippet that you can include wherever you'd like.

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