Forum Thread: Removing Online Posts

Okay, so a while back I shared a very personal story in an anonymous support group, long story short someone took that story and posted it to a very public site. I have tried contacting the site but they have a very strict policy on not removing anything posted to their website. Is there anyway to hack in and remove the post myself?

I'm pretty new to this stuff, it's something I've been interested in for a while but have only recently started trying out.