Adding a sitemap to your website will facilitate its proper indexing by search engines. The sitemap contains a list of all your site pages in a format which is easily readable by search engine bots.
1. Generate a sitemap online here: http://www.xml-sitemaps.com/. Just enter your website's URL address and press the Start button. Your sitemap will be generated in several file formats, suitable for submission at Google, Yahoo, etc. Download the XML version. Do not change the filename.
2. Enter the Admin View of your site and upload the sitemap from Control Panel > Site Properties > Special Features > Site Static Files.
3. To submit your sitemap to Google, first open a Google webmaster account from here:
a. Add the URL of your site on the dashboard and after entering its Overview, go to Sitemaps > Add Sitemap. A new page will open and from its dropdown choose to add a general web sitemap. Enter the URL of the sitemap (it should look like http://yourdomain.com/sitemap.xml).
b. Go back to the Overview and verify your site.
c. Google will now be able to fully crawl your website and provide detailed statistical reports containing data about the queries returning pages from your site, which of them were clicked, etc.
4. To submit your sitemap to Bing, sign up for a Bing Webmaster Tools account from here: http://www.bing.com/toolbox/webmaster. Once you have a Bing Webmaster Tools account, follow the steps from this tutorial in order to submit your sitemap.