I kick others because I can't set the room size to four people. I only have four people at once or the wait becomes boring and it is difficult to work out who the laggers are.
If you know how I can set room size please tell me

/set maxclients 4

I think thats the command. Anyone correct me if I'm wrong. I don't host servers that often.

Komapsumnida

but how to add it private?

There.

or u can use /set desc (name of server goes here)
u can make the server name PRIVATE