JSFiddle - React, Tailwind, and code Playground

HTML

<div class="myClass">
  <ul>
      <li>Login to your account</li>
      <li class="replace">Visit the Accounts ? Invoices page</li>
      <li>Click the <span class="bold">Pay Now</span> button</li>
   </ul>
 </div>

JavaScript

var el = document.getElementsByClassName('myClass')[0].children[0].children[1];
var text = el.innerHTML;
el.innerHTML = text.replace('?','-->');