So I'm confused (what else is new?) ...
The website is: http://9gag.herobo.com/
and the thing you want to remove is: "powered by 9gag.herobo.com"
So it's "powered-by" your own website?
I would expect that message to indicate the name of the template author or something like that.
If it's just some unnecessary eye candy, you can remove it. I just don't know why it's there to begin with.