What do you want to do with your sitemap? Do you want to display it in your site or submit it to Google?

Just submit it to google and other search engines and update it when I make changes

Go to Google and setup an account then verify your site.
http://support.google.com/webmasters/bi … swer=35179
After you verify your site you will be able to submit your site map using the url in the earlier posts.
When you make changes to your sitemap you only need to re-upload it to the same location and Google will see the changes. You don't have to submit it again.