ti-inelcom
In demo site of GK Hotel, it's custom HTML module so make sure that when you edit this module, you need to turn off default editor in Global Configuration in backend first, because the default editor often strips HTML tags and cause issue.
Here is content of this module on demo site:
<h3>
Sign up to keep in touch!
</h3>
<p>
Be the first to hear about special offers and exclusive deals from Villa Belluci and our partners.
</p>
<form action="index.php?option=com_acymailing&ctrl=sub" method="post">
<input type="email" required id="user_email" name="user[email]" placeholder="enter email address">
<input type="submit" value="Submit" id="gk-newsletter-submit">
<input type="hidden" name="acyformname" value="formAcymailing1" />
<input type="hidden" name="ctrl" value="sub"/>
<input type="hidden" name="task" value="optin"/>
<input type="hidden" name="option" value="com_acymailing"/>
<input type="hidden" name="visiblelists" value=""/>
<input type="hidden" name="hiddenlists" value="1"/>
<input type="hidden" name="user[html]" value="1"/>
</form>
<!-- Configuration details: https://www.acyba.com/acymailing/248-acymailing-external-subscription-form.html -->
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