The Terms of Service wrote:
Your full real name (first and last) is required for registration. You may be asked at any time to provide proof of your real name. Your name will be attached to every post that you make and may be included in search engines such as Google.
You agreed to the above when you made both accounts.
Mydnight isn't a real name, and I wonder what kind of name nixon na is. This is probably why you can't post.