On the bottom of the page you'll see Contact! Go there and write in to them and they will check it out for you. Or if one of the Mods is online and you're following them, you can direct message them. Good luck!
You can always contact one of the mods who are Kass, David, and Emily.
I'm sorry to hear that someone on Blurtit is annoying you, but don't worry, the user in question will be sanctioned appropriately, and I can help you.
Blurtit is a very friendly site normally, and it is a pity that a few people spoil it for the others.
Whenever there is a problem though, just contact one of the admin team and they will take the necessary steps. Your safety and well-being are a number one priority on this site.
I know a lot of people (myself included) have made good friends on Blurtit, and it is certainly an even more fun experience when that happens. I hope you will continue to enjoy the site once this matter has been dealt with.