You are posting as a guest, there are many restrictions in doing so. It's not the case forum but possibly a misfire of the spam/swear filter.
You need to get your kmcclung username to be registered so it won't do that. If it's already asking you for a password when you post, just enter one in lower case (don't make it the same as the username as the spambots change those every night).
If it's not asking for a password, click on the Login Status at the top of the forum list and click Log out. Then it should ask for a password and that after that, it will remove any restrictions. The guest account is really just for casual people who ask a single tractor question and never come back.
See my email to you because you have other usernames that are registered. It may be one of those that you mean to use and they should work already.