You must have joined Rakuten member during Rakuten credit card application step above, just access e-NAVI site. You should access it with you Rakuten member ID and password.(3)If you have Rakuten or Mitsuisumitomo , Tokyo Mitsubishi UFJ, Mizuho Bank account and use their Net Banking service, you can register their Bank account as your transfer savings account of Rakuten credit card online. How to open Rakuten Bank account is mentioned in Life in Japan.com page. If needed,please refer to the Rakuten Bank page.
If you are memeber of these banks and using Net Banking service already ,please access this page and refer to how to set your bank account as 振替口座 of Rakuten credit.