Submit a sitemap to Google Webmaster Tools

Go to Site Configuration -> Sitemaps. Click on Submit a Sitemap and below on the pop up text field.

    system/feeds/sitemap

Your sitemap URL will be:

    http://site.google.com/a/(your_domain)/(site_name)/system/feeds/sitemap

Or

    http://(site_name)/system/feeds/sitemap

See Google support link for more information.

Blogger: Hide the display of the Navbar

Go to Layout -> Edit HTML. Paste the code below before within the tags, for example before the #header-wrapper block.

#navbar-iframe {
              height:0px;
              visibility:hidden;
              display:none;
}

Then save your template.

Google Sites: Reorder Pages in Navigation Bar (Sidebar)

Go to More Actions -> Manage site -> Site Layout. Then click on edit link under Navigation.

A Configure Navigation popup will be displayed. Then uncheck Automatically organise my navigation.

After you're finished click on OK.