Help with reverse DNS.

I would like to set up reverse DNS for my internet connection, but I am unsure if my DNS provider supports that. I use URL as my DNS provider, but I see no mention of reverse DNS on thier site. I called up my ISP, and they said that I just need to give them the word and they'll relinquish authority on the DNS form of my address, but to be sure to configure reverse DNS with my DNS provider before that. Can I get some insight on if that DNS provider can do that, and if it can't, then what's a good DNS provider that does?

Ok, I just found out that my DNS service supports PTR records, but I'm still lost... I can't even find where the PTR records go.