Options:
1. Try registering and identifying to a new nickname... first do /msg nickerv register password [email]email@address[/email] (maybe at this point they'll send you an email for confirmation), and then /msg nickserv identify password.
2. Join the network #help channel and ask for assistance on registering your nick and/or joining that specific channel
3. Find a different room to chat in. When people tell you explicitly that you are not wanted there, then you are most likely not wanted *shrugs*
