<ul>
<li>Go to <a href="https://openid.stackexchange.com/" rel="nofollow">https://openid.stackexchange.com/</a> and click on <a href="https://openid.stackexchange.com/account/register" rel="nofollow"><code>Register</code></a>. </li>
<li>Create a Stack Exchange OpenID account</li>
<li>Follow the directions explained in <a href="http://meta.stackexchange.com/questions/793/how-do-i-change-my-openid-providers">How do I change my OpenID provider(s)?</a> to add a new OpenID</li>
<li>Choose your new Stack Exchange OpenID as the provider to add</li>
</ul>