WebPlus X6: Change description on site properties page

Hello

I've just published my first ever web site! http://www.piva.org.uk/index.html

Despite numerous goes at proof reading, what I didn't do was double check the site description (under Search Terms on the Site Properties page) I have a typo! First thing I noticed when I put a link to the new site on Facebook SM:MAD

I have changed it and re-loading the complete site but the typo is still showing. Any advice please?