title: Vim's surround plugin usage
body: <p>I just downloaded vim today.</p>
  
  <p>The <a href="http://www.vim.org/scripts/script.php?script_id=1697" rel="noreferrer">surround</a> <a href="http://www.catonmat.net/blog/vim-plugins-surround-vim/" rel="noreferrer">plugin</a> documentation says:</p>
  
  <blockquote>
    <p>Press <code>cs"'</code> inside <code>"Hello world!"</code> to change it to <code>'Hello world!'</code>.</p>
  </blockquote>
  
  <p>But where am I supposed to press <code>cs"'</code> and in which mode?</p>