Yes it is possible,
But you will need to access your site externally, hopefully you have cpanel.
Simply go to file manager/root directory/public_html
The locate the page in question, click on the html page name
then on the top right hand side in the page you will see edit page
This will open the pages source code.
Locate the meta description and enter in the information
Hope this helps
if not send me a link to the page inquestion
cmark@people.net.au and I will take a look for you.
Cheers
mark
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Just your average bloke trying to make a difference
Volunteer Opportunities Abroad