That depends on two things, 1: the network and its procedures and 2. how the founder has modes set. Some only allow founder to change it, others allow all sops or ops to change it, etc. Regardless tho, users cant change it, only @ and they can do it in channel modes, or by typing /topic #channel newtopic Check out the help file on this by typing /help /topic and also /help /mode
Check the website for the network you frequent to see its services and commands for channels.
