MyBB Community Forums

So some people think it's funny to constantly join my forum with both a) no username and b) other members username. I can't ban them or anything as whenever I try edit/ban, they either come up with the real members username and if you ban, it bans the real person. Also, with the guy with no characters/blank name cannot be edited/banned.

How can I fix it? Thanks.

ACP > Configuration > Banning > Disallowed Usernames

There specify the names or strings you don't wanna allow in usernames.
For blank names try [space]* or something like that.

In my site I always have legend profiles registered (like Yaldaram etc.). Some are real, most are fake.
I personally contact them to ensure before banning the fakes.

I can remember I attacked Polarbear541 unknowingly thinking as a fake and he kindly contacted me here over PM :p