Btw, many people tend to confuse mIRC registration (when you pay for the use of the piece of software) and nickname registration (which is
for free and is independant to every network (i.e. you register your nickname with DALNet, and then you also register your nickname with Undernet -no spam intended, guys...).
It seems that to enter that channel of yours, you need to register your nickname... if that's what you've done, I believe that a simple private message to any of the ops in that channel would bring the topic about you not getting voiced when you should... not many people respond to emails