myuser will not overide the ident your shell is sending. mostly your ident will be your username that you use on your shell account. Best to email the IRC server admins and ask them exactly what was wrong with your identd.
The lifecycle of a noob is complex. Fledgling noobs gestate inside biometric pods. Once a budding noob has matured thru gestation they climb out of their pod, sit down at a PC, ask a bunch of questions that are clearly in the FAQ, The Noob is born