Set the src attribute to the URL that accesses the image.

<html>
<body>
  <h1>Hackers Strike Again</h1>
  <img src="https://getmimo.com/r/hacker.png">
  <p>
  A hacker group has replaced government websites with livestreams of cats. While some praise their acts, many are against them.
  </p>
  <p>
  <em>"We need more cats in government"</em><br>
  - says local <strong>cat lady</strong>.
  </p>
 </body>
</html>]]>

Make sure to assemble ="https://getmimo.com/r/hacker.png".