how to update bank details on student loan repayment account?

hi i got a new debit card today so new card number, and i'm not sure if i need to update these details with student loan repayment. i logged onto my account and went to update details, but there is no section where i can change bank details. its been a while since i logged in and it got me wondering if they even need these details since there is nowhere for me to provide them?