To add ACH to your account for automatic payments, click on the Users tab:
Click on Billing:
Click on "Add Bank Account"
Select your bank from the list. You can use the search bar to find your bank if you don't see it on the list.
You'll be prompted to log in to your bank account to connect it, either through your bank's website or by entering your credentials.
After your account is connected, it will be set as the payment method for your next invoice.