How to create a room command

I need help I do not know much c + + so I made this post
Someone who can give me a little tutorial on how to create a command to change the name of the room

If possible also how to change the number of player

Excuse my English.

Working source 1.5 :):

If you use a guideline of /change_password then you should be able to do it. Can i just say that this is useless.