How to add discalimer text text to login signup popup form

Hi,

https://alina-gallo-h9cc.squarespace.com/ At my this site i can see the Sign In link when i can click its appear a popup window.. I want to add text under the button with link to my privacy page.

How can i do that kindly help me.

I tried it with javascript.

but it is not working out

 $(document).ready(function() {
      var elem = $('.drCMwAMHQMFX4m34glK5');
      var node = document.createElement("div");
      var checkbox = '<input type="checkbox" name="signup_checkbox" required="required" />';
      node.innerHTML = checkbox + " I have read the information provided pursuant to <a href='/privacy-policy' style='color:#000;' ><u><b>Privacy Policy.</b></u></a>";
      var checkbox2 = '<input type="checkbox" name="2nd_signup_checkbox"/>';
       
        elem.before(node);
      });