title: Changing which git website to push to: from GitBucket to GitHub
body: <p>Goal:
  When I do <code>git push -u origin master</code> I want my local PC to push to GitHub instead of BitBucket.  </p>
  
  <p>Background:
  I had BitBucket setup in my Mac as default website to push code to.  But I decided to switched to GitHub for a new project.  Here is my cmds and error I got:</p>
  
  <p>Commands:   </p>
  
  <pre><code>cd proj1
  git init
  echo "# tmp" &gt;&gt; README.md
  git add README.md
  git commit -m "first commit"
  git remote add origin git@github.com:myusername/proj1.git
  git push -u origin master
  </code></pre>
  
  <p>Error:</p>
  
  <pre><code>git@github.com: Permission denied (publickey).
  fatal: Could not read from remote repository.
  
  Please make sure you have the correct access rights 
  and the repository exists.
  </code></pre>
  
  <p>Thanks in advance for your help.</p>