We've had a load of new members this year (about two per week) so now's probably a good time to remind/advise about the names that show on the posts.
When you register you enter a "Username" which cannot be changed.
However, if you get fed up with the typo or stupid name that you entered (or if you change bikes like I did), you can change the "Display Name in your profile. This is what shows on the forum and is automatically set to your username when you register.
Change it in "Profile" / "Account Settings" / "Name"
Steve