title: how to set extended permission required?
body: <p>I found the article very nice to introduction set extended permission required 
  <img src="https://i.stack.imgur.com/91xjR.png" alt="enter image description here"></p>
  
  <p>(<a href="https://developers.facebook.com/docs/beta/authentication/#referrals" rel="nofollow noreferrer">https://developers.facebook.com/docs/beta/authentication/#referrals</a>) </p>
  
  <p>but I go to Auth Dialog setting, the field required permission replaced users &amp; friend permission. I can't see field required permission. please help me. thanks</p>
  
  <p><img src="https://i.stack.imgur.com/4K6Nu.png" alt="enter image description here"></p>