Ability to control html of form

This looks like a great plugin, I really like how it allows more than one form on a page. However, I would like to control the html of the form – any way to do that? I couldn’t see that option.

I just want to do something like this:
<input name=”EMAIL” placeholder=”Email…” required=””
type=”email”>
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The page I need help with: [log in to see the link]