There’s no need to worry about how to claim your credits as they are UNLIMITED. When you first join you can download as much as you like, apart from games which are limited to one per week.
If you cancel your subscription you have 5 days to use your credits or risk losing them all
The credits are unlimited so don’t worry about checking them. If you want to know how many you’ve used, then go to the download page on the Clubzed wap site.