Click here and go to the CRA register page
Click SIGN-IN PARTNER to login with your banking info (this option allows you to login without waiting for a password from CRA), OR;
Enter your social insurance number, personal information, and a certain line number from one of your past two tax returns
Choose a user ID and Password
In 7-10 business days you will receive a security code sent in the mail by CRA
Sign back into CRA and enter the security code
Go to view mail (left side of account homepage)
Open CCB notice