title: How to "Unlock Jenkins"?
body: <p>I am installing Jenkins 2 on windows,after installing,a page is opened,URL is:<br>
  <a href="http://localhost:8080/login?from=%2F">http://localhost:8080/login?from=%2F</a>       </p>
  
  <p><strong>content of the page is like this:</strong><br>
  <a href="https://i.stack.imgur.com/EeLNT.png"><img src="https://i.stack.imgur.com/EeLNT.png" alt="enter image description here"></a></p>
  
  <p><strong>Question:</strong><br>
  How to "Unlock Jenkins"?   </p>
  
  <p>PS:I have looked for the answer in documentation and google.</p>