As far as I know, it cannot be done on your own. You would have to appeal to one of the mods. If it is just a "post" you could erase whatever you said, using "edit" and put in ........ If it is a thread it cannot be deleted without help of mods.
Most on here get their posts and threads deleted... should not be a problem as soon as a mod finds it...
I think its too late to edit the post. Just post an update to the thread. No point in having a mod delete it & start over.... just update it. In other words just post your updated info etc.... ???