With the recent change to the increased security version of gamesas, it's caused some issues with being logged out when visiting non-secure links. It's also caused some issues with redirects.
When you go to either the addcard or redeemcode pages, you will be asked to sign in but when you do, it will redirect you to the homepage, instead of back to the previous page.
Please use the following links instead, whilst we sort out the redirection and login persistence issues:
https://secure.gamesas.com/addcard
https://secure.gamesas.com/redeemcode
Thanks!