This article will guide how to setup the sitemap in magento
Step 1: Setting and Enable the Sitemap
Enable and finish all the XML Sitemap configuration to determine the limitation of sitemap files and how frequently the sitemap is updated.
Step 2: Setting and Enable robots.txt (Optional)
Enable and finish the Search Engine Robots configuration with instructions that direct search engines to crawl the parts of your site that you want to have them indexed. This task is optional.
Step 3: Submit Your Sitemap to Search Engines
You enable to submit your sitemap to different search engines by sending them a link to the sitemap.xml file in the root of your Magento installation
If needed, you are allowed to restore to the original or default restrictions.