title: Mercurial error: abort no username supplied
body: <p>Problem on WindowsXP (likely will happen on all Win installs), first time using Mercurial. I found the answer in an inobvious place so I'm asking/answering the question myself so others don't have to search like I did.</p>
  
  <p>First time using Mercurial on machine.</p>
  
  <p>Add new repoz:</p>
  
  <pre><code>c:\bla\&gt;hg add
  </code></pre>
  
  <p>no problem.</p>
  
  <p>Next, commit:</p>
  
  <pre><code>c:\bla\hg commit
  </code></pre>
  
  <p>error:</p>
  
  <p><b>abort: no username supplied (see "hg help config")</b></p>