If you bank with FNB you can register for 3D Secure by doing the following on the FNB website (logged in).
- Select the "My Bank Accounts" tab
- Then select the "My Cards" tab
- Find the card you want to activate
- Click on the "Activate Now" link in the "Verified by Visa" column
- Fill in all your details as prompted
- You will be sent an OTP to your mobile phone - enter this in the OTP field
- Once done, your card will be good-to-go for your next online purchase