After logging into your CRA My Account, click on the link titled Change CRA Password. You will be directed to a page where you need to enter both your current password and a new password in the boxes provided. Follow the password checklist required for developing a secure new password. Type the new password a second time in the confirm new password box, and click Next. If your current password is entered correctly and your new password meets the criteria outlined in the checklist, the change will be accepted.
Register for a CRA My Account.
Learn more about registering for a CRA My Account.