Les -

If you "substantially mangle" a post, a common procedure is to re-post a corrected version immediately. The "clones" who maintain things will often delete a duplicate post automatically, if they find it; but it's a "courtesy thing" to go to the Help site (link at the far right of the page header) and post a "please correct" or "please delete" message there.

You should be aware that the Help site is on a different server, and still needs scripting for anything fancy - but there's no need to put anything fancy there. It may drop a paragraph break if you don't <br> it, but will pick up "double paragraph" breaks without coding i.e. "enter" twice in a row, and it will "newline" without coding.

If you have a "really special" need for a correction, deletion, or some such, a PM to Joe Offer or another of the staff/helpers will usually get attention.

You cannot, generally, make changes to your own post once it's sent.

John