title: Cannot create branch in Github
body: <p>I am trying to create a branch on someone else's repo. I am trying to follow the official instructions, but I get stuck here because Github apparently should offer to create a branch when I type it in? But here, nothing happens.</p>
  
  <p><img src="https://i.stack.imgur.com/A8Ju1.jpg" alt="enter image description here"></p>