Create a Hyperlink or Link directly in Google Sites using the WYSIWYG menu bar. when creating a link, Google Sites provides various options to link existing page / image/ search for pages/recently edited pages , link to an external website or a Google Apps Script.
<a href="http://www.goopal.org" target="_blank" rel="nofollow" title="Goopal">Link</a>
Verify your Email in Google Plus. Their are full public/privacy/Circles options.
There are several different types of Rich Snippet.
Rich Snippets Highlighted
For a particular page you would like to show Google Plus Rich Snippet.
Include the following
How the Rich Snippet look in SERP [Search engine Results Pages].
Once you have tested your Rich Snippet is visible with the Testing tool above.