On the server you need to install a Role Service called Management Service. You find this by going to ServerManager->Roles->WebServer(IIS) and then looking in right panel, section RoleServices. There it is, and there you can click to add it to the config.
W3Clove is a free to use web service which crawls any given website to generate the sitemap of it (or accepts sitemaps directly) and validates each URL through the W3C's validator.