How to "Unlock Jenkins"?
<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>