Indian Railway Catering & Tourism Corporation [IRCTC] — irctc new website login

I am an old customer of irctc and use to book my tickets on line. On 26th june 2018 when i opened the irctc i was surprised to see a new format where log in is not required. After selecting my booking preferences when i clicked book button then the log in page appeared and further booking was done easily. But there was no sms or e mail confirmation. I donot know how to cancel the ticket or to make changes to my profile. There is no guide/ tutorials. You should not make sudden changes without proper information and guidance. No update is available about this change in internet. Kindly provide details of how to operate the new system.