Trouble adding checkbox to built in theme form

I have been trying to add a check box to the built in forms that came with my theme at http://www.brooksherballet.com to no avail. I inserted the suggested html:

<label><input type="checkbox" name="mc4wp-subscribe" value="1" />Add me to the mailing list.</label>

This is added inside the footer.php file of my theme. The surrounding .php is as follows:

<!-- BEGIN #contact-panel -->
<aside id="contact-panel">
	<h4 class="hb-focus-color"><?php echo hb_options('hb_quick_contact_box_title'); ?></h4>
	<p><?php echo hb_options('hb_quick_contact_box_text'); ?></p>

	<form id="contact-panel-form">
		<p><input type="text" placeholder="<?php _e('Name', 'hbthemes'); ?>" name="hb_contact_name" id="hb_contact_name_id" class="required requiredField" tabindex="33"/></p>
		<p><input type="email" placeholder="<?php _e('Email', 'hbthemes'); ?>" name="hb_contact_email" id="hb_contact_email_id" class="required requiredField" tabindex="34"/></p>
		<p><input type="text" placeholder="<?php _e('Subject', 'hbthemes'); ?>" name="hb_contact_subject" id="hb_contact_subject_id"/></p>
		<p><textarea placeholder="<?php _e('Your message...', 'hbthemes'); ?>" name="hb_contact_message" id="hb_contact_message_id" class="required requiredField" tabindex="35"></textarea></p>
		<p><label><input type="checkbox" name="mc4wp-subscribe" value="1" />Add me to the mailing list.</label></p>
		<a href="#" id="hb-submit-contact-panel-form" class="hb-button no-three-d hb-push-button hb-asbestos hb-small-button">
			<span class="hb-push-button-icon">
				<i class="hb-moon-paper-plane"></i>
			</span>
			<span class="hb-push-button-text"><?php echo hb_options('hb_quick_contact_box_button_title'); ?></span>
		</a>
		<input type="hidden" id="success_text" value="<?php _e('Message Sent!', 'hbthemes'); ?>"/>
	</form>

</aside>
<!-- END #contact-panel -->

<!-- BEGIN #hb-contact-button -->
<a id="contact-button"><i class="hb-moon-envelop"></i></a>
<!-- END #hb-contact-button -->

The checkbox displays and appears to function correctly but there is no change made to my subscription lists when tested.

https://wordpress.org/plugins/mailchimp-for-wp/