How do I remove a site from squidGuard blacklist?

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http://askubuntu.com – I have just installed squidguard in my server to restrict porn or adult site. I followed these instruction. It's working great. Problem is squiguard list(blacklist) youtube.com as porn site. I want to remove youtube from blacklist. How can i do this? Database save in /var/lib/squidguard/blacklist/... I found several youtube site links in blacklist/porn/uris but when I tried to open it with gedit (with root permission) it says some char does not show, modify this file can corrupt the file.` Is there any good way to remove a site or add a site in squidGuard Blacklist? (HowTos)