Around a fortnight from the date your RFID card is due for annual renewal, you will receive a reminder email, letting you know renewal will take place. The email is purely for your reference and, as long as you want to keep the card current, you do not need to take any further action.
You can ensure your payment card is current, so your RFID card is successfully renewed by logging in to the portal here, selecting "Your Account", then selecting "Payment Card" from the drop-down menu. From here, you can select "Update Payment Card" and the PayPoint instructions will lead you through the steps to do this.
If you do not wish to renew your card, this article will help you.