How can I delete one post?

How can I delete one post?

Flag it & ask the moderator to delete it for you.

MODERATOR’S NOTE:

Be advised, though, that our most common response is:

Per Terms of Service: “We cannot edit or delete posts upon request”
https://auth.collegeconfidential.com/module.php/hobsonspolicies/policy.php?policy=tos

Exceptions may be made if you posted your real name or SSN, but not because you later regret making the post.

See the below from FAQ:
http://talk.qa.collegeconfidential.com/faqs-on-college-confidential/1926958-can-i-have-my-post-deleted.html#latest

what about a bunch of posts i made under my real name (before this account). just wondering

Same answer, with the caveat that you cannot have 2 accounts.