First, hover your cursor over your name on the upper-right corner of your screen, then click "Bank Account".
On the following page, click the "Add a bank account" button.
Afterwards, you need to indicate the bank account type (Checking, Savings), and provide the 9-digit routing number and bank account number. Click the "Submit" button, and you should see a new page indicating that the submission was successful. It will take a few business days to review and approve your bank account. Once your bank account is approved, you will receive an email confirmation indicating that your account is ready for use.