Submit button not working

I have installed the plugin and called it directly inside my custom theme using
<?php mailchimpSF_signup_form(); ?>
The form displays perfectly but nothing happens when you click the signup form. The form’s action attribute is simply action="#mc_signup" and the plugin doesn’t seem to be inserting any javascript anywhere.

Any ideas what could be going wrong or what I could do?

Another problem I’ve had is trying to include the signup form in the wordpress admin area. I created a page at https://momofishspa.com/wp-content/themes/momo/mailchimp.html which works on its own. I’ve included it in the admin area by doing this:

add_action('admin_menu', 'add_pages');

function mt_add_pages() {
	add_menu_page(__('Add Subscriber','Add Subscriber'), __('Add Subscriber','Add Subscriber'), 'read', 'add_subscriber', 'add_subscriber' );
}

function add_subscriber() {
	include 'mailchimp.html';
}

Similarly, this shows the form in the admin area but the submit button doesn’t react at all when clicked. Really appreciate any help or suggestions, thanks.