WordPress MU

I tried to find this subject but did not..

I have selected "Users must be registered and logged in to comment".

Program replies:
User not found. Please ask them to signup here first.

So, i ask my friend to try to comment. All we find there is Login. No where is Register to be found.

What am i doing wrong?

Thank you very much!

I have a new installation and I also have the same error...help!

Thanks

yourdomain.com/wp-signup.php

select "just a username, please"

Iron, thanks a lot for your help....as it turns out, I had new registrations disabled!