There are some powerful options that should only be used by those with a firm command of the technology, or they could have major unintended side effects. You can find these options under the Advanced tab.
Mobile Device Rules lets you configure your page set to have specific behaviors for specific mobile devices or types. Mobile device rules are inherited from your Public Pages, but you can define specific rules per page. You can edit the Look and Feel of specific pages for mobile devices, including the theme. This is explained in Mobile Device Rules.
The Robots option lets you configure
robots.txt rules for the domain: both
its public and private pages. The
robots.txt file provides instructions to
search engines and other tools that are automatically crawling and indexing your
Site. Common entries here include defining some pages not to be indexed.
The Sitemap option generates a sitemap you can send to some search engines so they can crawl your Site. It uses the industry standard sitemap protocol.
Select a search engine link to send the sitemap to it. It’s only necessary to do this once per Site.
If you’re interested in seeing what is sent to the search engines, select the preview link to see the generated XML.