Jenkins: GitHub hook trigger for GITScm polling : <p>I try to configure Jenkins. I want a simple behavior: trigger a build on new pull request.</p>

<p>So, I created a job and configured it, but I checked the checkbox for:
<a href="https://i.stack.imgur.com/QFrZk.png" rel="noreferrer"><img src="https://i.stack.imgur.com/QFrZk.png" alt="enter image description here"></a></p>

<p>And as you can see nothing is dropped down.</p>

<p>If I click the question mark on the right side, I see:</p>

<blockquote>
  <p>If jenkins will receive PUSH GitHub hook from repo defined in Git SCM
  section it will trigger Git SCM polling logic. So polling logic in
  fact belongs to Git SCM.</p>
</blockquote>

<p>But where is the "Git SCM section"?</p>
