This is done in your Ascen dashboard. Once you log in, you can tap on the 'Settings' icon and then 'Direct Deposit'. From here, follow the steps to update your banking information.
For more information, see Ascen's help center article: How do I change my payroll bank account?
*This is only for W2 Taskers employed through Ascen for payments related to W2 tasks. If you are trying to update your payout method with Stripe, click here.