title: How to continue testing in TestFlight after stopping
body: <ul>
  <li>I installed an app via testflight.</li>
  <li>Once done with it, I clicked <em>Stop Testing</em></li>
  <li>It disappeared from my list</li>
  <li>I now want to test again. I've tried redeeming the code and it just tells me I've already opted in.</li>
  </ul>
  
  <p>I just need to know how to undo the <em>Stop Testing</em> action.</p>