Armor undo unblock sites

I have the trial version of Armor installed on my router and I am kind of impressed however I have an issue. One of my three NAS drives reported trying to connect to a spam site so I was investigating. I unblocked the site so I could in the sandbox determine why the NAS drive was trying to connect to it. I figure the way back to blocking the site would be just as easy to do however it isn't.

How do you reblock a site after unblocking it?

Thank you in advance,

George