Plug-in Settings
Managing Instagram Settings
Managing Mail-chimp Plug-in Settings
You should create the account in https://mailchimp.com and connect the account with your API key.
<p class="center">Subscribe to get a latest updates!</p>
<div class="newsletter-wrapper">
<input type="email" name="EMAIL" autocomplete="off" class="email-form" placeholder="Enter your email..." required />
<input type="submit" value="Subscribe" />
</div>