Login to your 123-reg control panel.
Click on the Web hosting option in the The following service(s) will soon expire! section at the top of your 123-reg control panel.
Or click on the Web Hosting button in the Web Hosting Section.
This will take you to an overview of your Hosting packages, showing information such as the domain name and the expiry date. To renew, click on the Renew link on the pink bar.
Please follow the on screen payment instructions to complete renewal.