Here is a little post on how you can register to stardust channel. All you need is an e-mail address and a credit card. You will have to pay 432円 (around 4US$) a month for the membership.
Go to this site (https://secure.emtg.jp/stardustch/3/regist/?_ga=1.34427553.1434223302.1448645608) and klick on the button seen in the picture above.
