First, check if you have already have an account with Citibank.
If you already have an account, you don't need to register agin.
Just Click on the "Sign On" button.
Enter your username and passwrod to log in.
Once you sign in, the card activation option will appear on your screen.
Now you can easily activate your card.
If you are new and don't have an account, click on "Register" or "Enroll Now".
You will need to enter your card details and create your login information.
After creating your account, sign in using your new username and password.
You will now be redirected to the card activation page.
Follow the instruction shown on the screen and complete the activation process.
Once done, your Citi card will be ready to use.