Well, it was clear somewhat.
It is not necessary that the user be IRCop.
I simply can not set Channel Operator for specific user.
whatever I do get the message
You're not channel operator
Reading the documentation did not help, because does not say where (or how) to set the Channel Operator.
Although it may sound strange to me is absolutely illogical that's how it works: the server operator can not perform various operations on channels. It's like you're an IT administrator in some company, and you can not install and uninstall applications because other users using it, but only monitor (and maintain) the network. This is my view and maybe someone does not agree, but I think it makes sense.
But ok, it's not so important.
However, the problem is that now appears that the name is already taken (after restarting services). After that I get the following: "No O-lines for your host" when I try to use /oper command. Than again, I get the message the name is already taken.
It should be noted that I have not changed anything in config and now it appears that some login errors. It seems to me that I lost a lot of time
. I'll try some servers to get acquainted with the various options offered, maybe might have more luck, although I like this server.
Thanks for your help and time spent (I might still try again later).