You have 12 hours to edit and/or delete your post. After that your only option is to have your account banned and your username changed to a number. But we do not allow people to do that and then sign up again under a new name. We have discussed this and announced it and re-announced it and people still keep asking for it as though they are special and the rules that apply to everyone else don't apply to them. If we start allowing people to delete their accounts and sign up under a new name, people would be doing that ALL THE TIME, and it is not part of our jobs as moderators to go around with a broom and dust-pan fixing everyone's indiscretions. If you want something to be private don't post it on the internet, cough up the big bucks and pay a therapist or a shrink to keep your secrets secret.