Register your handle
Just go back to the Index page and click on "Submit your profile" at the top. It only takes a few seconds, and you do not have to divulge any personal info. Then, no else can post using your handle.
Also, you will have a password stored if you ever want to delete one of your posts. It is not necessary to enter the password each time you post.
Yes, "Rand McNally" is that same pathetic psychopath who has been trashing these boards for years, using a variety of handles. Impersonalting someone else is one of his favorite tricks.
I pity him and hope that some day he will get the professional help that he obviously needs.