Dear friends,

in language file there are 2 vars: $l_anonDisallowed and $l_anonAllowed.
What parameter in settings file does controls which of them to become used?

It's not about settings, but the core script. Depending on multiple settings combination, it will display this or that.

If you know how to search in files, you'll find this script.
The conditions are in index.php.

Thanks for your reply!
on my forum the anonymously posting is forbidden but at the post entering form a label is placed 'You are welcome to post anonymously, by entering a nickname with no password (if the similar Username has not been taken yet), or by leaving both fields empty. If you have a forums account, you can also sign in from this page without posting a message, or sign in and post at once.' - so it is disinformation.

How can I to fix it?

Which way did you "forbid" it?

Sorry, I don't know. Just it forbidden now. You can look/try it inetmlm.info

I'm not sure if you're missing the point.
I've entered your forums and posted from the guest nickname (eeewwwrrr).
It appears to be open for guests.

Set up $allForumsReg=TRUE; with no double slashes in front to make forums for members only.

Yes, you are right, now it open for guests :( I not know why I can't do it before.

'to make forums for members only' - thanks, it is that I want.