Launching a Mailchimp popup from a menu item

I'm trying to add a menu item that when clicked, will open a Mailchimp popup form. Although I'm familiar with VBA and Access Dev, I have limited knowledge of Web/WordPress Dev.

These are the snippets of code I've tried so far based on the research I've done online:

1) I found this one on several different sites. The problem with it is that it seems there isn't any way to get it to launch from a Menu item.

script type="text/javascript" src="//downloads.mailchimp.com/js/signup-forms/popup/unique-methods/embed.js" data-dojo-config="usePlainJson: true, isDebug: false"/script

script type="text/javascript"
  function showPopup() {
      window.dojoRequire(["mojo/signup-forms/Loader"], function(L) { L.start({"baseUrl":"mc.us20.list-manage.com","uuid":"YOUR_UUID_GOES_HERE","lid":"YOUR_LID_GOES_HERE","uniqueMethods":true}) });
//unsetting the cookie
  document.cookie = "MCPopupClosed=; expires=Thu, 01 Jan 1970 00:00:00 UTC";                  
  document.cookie = "MCPopupSubscribed=; expires=Thu, 01 Jan 1970 00:00:00 UTC";
  }

  document.getElementById("show-popup").onclick = function() { showPopup(); }
/script

2) This is the second one I've tried.

script type="text/javascript" src="//downloads.mailchimp.com/js/signup-forms/popup/unique-methods/embed.js" data-dojo-config="usePlainJson: true, isDebug: false"/script

script type="text/javascript"
  jQuery(document).ready(function($) {
      $("menu-item-364").on("click",function showPopup() {
      window.dojoRequire(["mojo/signup-forms/Loader"], function(L) { 
          e.preventDefault();
          L.start({"baseUrl":"mc.us20.list-manage.com","uuid":"YOUR_UUID_GOES_HERE","lid":"YOUR_LID_GOES_HERE","uniqueMethods":true}) });


////unsetting the cookie
  document.cookie = "MCPopupClosed=; expires=Thu, 01 Jan 1970 00:00:00 UTC";                  
  document.cookie = "MCPopupSubscribed=; expires=Thu, 01 Jan 1970 00:00:00 UTC";
  });
 });


document.getElementById("show-popup").onclick = function() { showPopup(); }

I also read another post where someone recommended using the addEventListener onhashchange event to launch the function and a) I wasn't able to get it to work and b) I have a concern that it would then launch anytime the hashtag changes - causing issues if I use anchors to navigate in other areas of the site in the future.

What am I missing?