I'm glad you brought this up.
I did try to add a comment earlier today concerning the mis-identified Mercury convertible in the Twilight Zone section (it is a Montclair, not a Park Lane) but the system would't let me. It requested I log in but I was already logged in.
Apparently you need to have both a user name and a nickname.
The site never asked me for a "nickname" when I first registered.
How do I add one?