Postal savings bank card opens online banking to modify the number of messages received dynamically. How to modify it? Not signed. What's going on here?

Hello, you can only change your mobile phone number at any branch of the bank with your ID card.

I registered myself on the computer without signing a contract. I didn't bring my ID card to the bank outlets to open personal online banking. After opening it, I have to re-register my personal information on my home computer and modify my login password. Only in this way can we complete the registration of online banking.

I hope I can help you and adopt it.