You can use WordPress's Custom HTML blocks feature to add a subscription form to your WordPress site.
First, create a new Custom HTML block. To learn more, read WordPress's documentation.
In the Custom HTML block, paste in the following code:
<form
action="
https://buttondown.com/api/emails/embed-subscribe/YOUR-BUTTONDOWN-USERNAME
"
method="post"
class="embeddable-buttondown-form"
>
<label for="email">Email</label>
<input
type="email"
name="email"
placeholder="you@example.com"
/>
<input type="hidden" value="1" name="embed" />
<input type="submit" value="Subscribe" />
<p>
<a href="https://buttondown.com" target="_blank">
Powered by Buttondown.
</a>
</p>
</form>
That's it! The new Custom HTML block will display a subscription form for your Buttondown newsletter.