regarding Sitemap , i need help.

hello guys,
actually my site is http://www.newscorn.com , have submitted sitemap on webmasters. but its not validating because of no “www” on the links in siemap. i have created ad-on domain on hosting like “www.newscorn.com”

I am using out “xml-sitemap generator ” plug in. but its generation links with out www. on site map. So Can i change in plug n or Can i change on Hosting from add on domain “www.newscorn.com” to “newcorn.com”