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How to disable this openDNS thing?

I'm using a Mac.
So, every time I open a website like twitter and youtube and facebook, openDNS always blocks it. It redirects it to a website (block-websites.com) and I'm not sure why this is happening.
Just a minute ago it was okay. I left it like for only 30 minutes (didn't shut it down) and then when I try restarting my Safari, I could not access these websites. Before I left it, I could open it.
The only thing I did is to open some youtube videos and download "genio" (not sure what it is) and installed it and then uninstalled it.
why is this happening? and how to fix this?
Thanks (: