To my edu-gator friend, and other new folks: you can correct your mistakes or change your wording, if you like. In your own posts only, you should see a second icon right next to the Reply to this Post one. Click on that one, and you'll be given a screen whereby you can edit all you like, then re-submit it.
As an aside, deletions can be interesting. It occasionally happens that someone posts something from another post--but, subsequent to the new posting, the original one or the relevant part of it, gets deleted. So, people are sometimes left wondering where a particular quote came from, since it is no longer visible!