I unblocked a site - now I want to block it again

Hi there,
 
I have a little bit of an unusual problem - I think!
I was given a link to a customers website (I'm a freelance copywriter) to get some information I needed for a project.
 
When I tried to follow the link I got the Webroot Block Page - with a malicious content warning. Unfortunately I had to unblock the site because the customer is not responding to my requests for alternative sources of information. Anyways - long story short I can now access this site without any problems or warnings popping up.
 
But now that I'm done with the site I want to block access to it again. My previous antivirus allowed me to 'undo' an unblock but I can't find anywhere to do that in Webroot. I could also easily add a site to my 'blocked' list using a radio button and view a list of blocked sites I had tried to access.
 
Where do I do this with WebRoot? (Complete - version 9.0.6.14)
 
And please note that I got a WebRoot warning - not a Google or Windows warning, so logically I should be able to turn the blocking for that site back on through WebRoot. At least, that's my understanding of what I need to do.
 
I have searched the forums but it seems that my circumstances are unique, although it may be that I think their solution doesn't apply to my problem.
 
Thanks in advance to anyone who can help - if they can help!
 
Silvering