Mailchimp

Step 1: Setup API Key

Step 2: Setup Form

This is code form:

<div class="ova-mc4wp-form">		
    <input type="email" name="EMAIL" placeholder="Email address" required />
    <button type="submit">Subscribe</button>
</div>
<p style="display:none">
    <label>List choice</label>
    <label>
        <input name="_mc4wp_lists[]" type="checkbox" value="a328b7e698" checked="true"> <span>Ovatheme</span>
    </label>
</p>