You can't. You can pm any moderator or hit the alert button (at the bottom of the post, triangle with exclamation mark) on the post in question and request it be deleted.
I know who some of the moderators are, but if you don't know, where would someone find this out? In some other forums I participate on, under the forum header (in the forum listing and in other places), it indicates who each moderator is, and you can easily click on the name to send a pm. Is that available here? (and I have completely missed it all along) Being that I'm half blind I think, it seems very difficult to find out who a moderator is, if you don't already know.
Bottom of what page? I still can't find it! #-o Although I doubt a person new to this site would think of looking there to find a mod, if they're used to other sites that list the mods.
All you have to do is post a RR, pics or talk about an illegal trail here -- you'll get to know a mod, uber fast Just Kidding!!!!!!
Why would you want to delete an entire post? Normally if I have regrets about something really stupid that I said I will just delete the text and insert a funny picture from the interwebz.