I may be dump but please help me in this.

im looking for ITT and OC batches but couldnt find any one at last yesterday I visited to ICAI BHAWAN and inquiry about next batch. They told me check web on 26/27/2feb. but idk where I have to login and book the slot.

I searched ITT/OC login and it reuires Username and Password and Idk what is username I only know userId(CRxxxxxxxx).

Could anyone tell me what is the username here means?