To set up your payout information on your Patreon creator account, you will want to log in to your account and then navigate to your payout preferences page:
From there, you will want to select whether or not you are a USA person or corporation, if you are an individual or a business/corporation, add your payout information, and also fill out the appropriate tax form.
After each update to this section, you will want to save the changes. If a pop-up appears saying that your account will be put on a 5-day lock upon saving, you will need to agree to this in order for the changes you've made to save. The lock will lift in 5 days (Pacific Time):
Step 4: Confirm that your information is successfully saved and you are all set. You've set up your payout information correctly.