: Go to the Citibank registration portal and click "Get Started" . You will need to enter the following details: Full Card Number . Name as it appears on the card . Security Code (3 or 4 digits on the front or back) .
If you have just received your physical card, you may also need to activate it before use. You can do this: My Best Buy® Credit Card: Register Your Card - Citi.com how to register best buy credit card
Last 4 digits of the primary cardholder's (SSN) . : Go to the Citibank registration portal and
: Follow the remaining prompts to set up security questions and paperless preferences . Card Activation Security Code (3 or 4 digits on the front or back)
: Choose a unique User ID (5–50 characters) and Password (8–64 characters) .
Note: Your password must include at least one uppercase letter, one lowercase letter, one number, and one special character .