...
Go to the Refined Administration.
Click Sites in the left-hand menu.
Select the site.
Click the Configuration tab.
Scroll down to the Sitemap heading and click Generate sitemap.
Your sitemap is now available at (subdomain).(domain).com/sitemap.xml, ready for you to submit it at the search engine(s) of your choice.
...
Go to the Refined Administration.
Click Sites in the left-hand menu.
Select the site.
Click the Configuration tab.
Scroll down to the Sitemap heading and click the Refresh sitemap button. The sitemap’s URL will stay the same: (subdomain).(domain).com/sitemap.xml. Don’t forget to resubmit the sitemap to the search engine(s) of your choice.