1) Can I change my username after ragistration?
You cannot change your username, so choose it carefully.
2) I can't get my confirmation email.
Pls check whether HaoBTC confirmation email was recognized as SPAM letter. If it was, change the settings for your convinience.
3) How to bind and cancel mobile number?
To bind or cancel your mobile number you just need to go to account settings, apply for certain option and approve it with the confirmation code you will get on your mobile.
4) Why should I do the ID verification?
Online transacting of fiat money requires providing of ID card, to prevent money laundering and other criminal acts. As a regular platform, we are obeying the law system and trying to keep Bitcoin system safe too.