Here, or somewhere else? Because I don't think I've even seen the word "filters" anywhere in the forum config or admin sections, much less enabled any. There is a "censored words" option, but its list is completely empty. Generally speaking, I hate censorship, and especially automated censorship, so I tend to avoid restrictions as much as possible. If someone abuses that, then they get warned, kicked, or banned as appropriate, but by a live human (me) and not a piece of code, so don't worry about it too much, unless you know your users are going to TRY to be jackasses. :-)