How to redeem Runescape code on Browser
1. Create/Login to Runescape account - https://www.runescape.com/community
2. Click on ‘Shop’ and select ‘Redeem Code’
3. Enter code and click on ‘Redeem’
Any further additional assistance can be acquired by contacting MYTrainz support at the following link : https://help.jagex.com/hc/en-gb