All posts that are in accordance with the College Confidential Terms of Service are left in place. Such posts are not removed because a poster later decides that they should not have posted it. Do not request moderators to remove such posts.
When posting to College Confidential, please assume that college admissions people and high school principals are reading your posts. If you post an essay, anyone can read and copy it. All posts to the Internet can be seen and copied by anyone who has a computer.
A more cautious approach to getting an opinion of your essay would be to ask a well-respected poster if they would read and comment on your essay—and then handle the matter via email.
Think about security before you post… on College Confidential or any other place on the web.