XML Sitemap Rewrite Issue

[a4amaan]

I have installed a plugin to generate sitemap, but it saying "Since you are using Nginx as your web-server, please configure the following rewrite rules in case you get 404 Not Found errors for your sitemap:"

rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml$ "/index.php?xml_sitemap=params=$2" last;
rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.xml\.gz$ "/index.php?xml_sitemap=params=$2;zip=true" last;
rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html$ "/index.php?xml_sitemap=params=$2;html=true" last;
rewrite ^/sitemap(-+([a-zA-Z0-9_-]+))?\.html.gz$ "/index.php?xml_sitemap=params=$2;html=true;zip=true" last;

Can someone guide me how to setup these rewrite rules?

[srisaikamal]

In .htaccess file.