On your home page, link to your profiles and add the rel="me" attribute to the links.
This may look something like the following:
<ul>
<li><a href="https://twitter.com/aaronpk" rel="me">@aaronpk on Twitter</a></li>
<li><a href="https://github.com/aaronpk" rel="me">Github</a></li>
<li><a href="https://plus.google.com/+aaronpk/p/pub" rel="me">Google</a></li>
<li><a href="sms:+15035551212" rel="me">(503) 555-1212</a></li>
<li><a href="mailto:[email protected]" rel="me">[email protected]</a></li>
</ul>
Note: If you don't want visible links on your home page, you can instead use <link> tags in your html header.
<link href="https://twitter.com/aaronpk" rel="me">
That's it! You're done! Now you can use your domain to sign in to any sites that support IndieAuth!