After you have signed up to Goodstack, if your claim is approved, you can edit your profile in the Causes Portal (here).
In this section, you will be able to submit your bank details. Once you have done so, we will review them to make sure they are valid and correct so we can offer you a smooth payment experience (see here for more information about when we can not accept the details you have submitted).
Please feel free to submit a request if you need help submitting your bank details directly to your profile.