It's just a chan site. The most danger you're in is that you will at some point see a woman with a penis.

Don't post anything about yourself, don't talk about yourself, don't try to give yourself a name. Don't post any pictures of yourself, and you'll be fine. Frankly, if you're new to the chans you shouldn't post anything for a long, long time; but if you're too worried about being on there you probably just shouldn't visit; if anyone posts anything important on any of the chans, it'll be filtered down to everyone else eventually.