To adjust payment details, navigate to your profile by clicking your profile photo or username in the top-right corner.
Scroll down to the "Payment Details" box at the bottom of the page on the left side.
Changing your details is simple:
To add bank account information, click the blue "Add" text in the top-right corner of the box.
To change a bank account to the default account that your payments get sent to, click the three dots found in the top-right corner of each bank account listing. Click the option that reads "Make default."
To delete a bank account, click those same three dots in the top-right corner of the listing. Click the option that reads "Delete."