To add your US bank account to my Dynadot account, please follow these steps:

1. Sign in to your Dynadot account.
2. Select "Payments" from the left-side menu bar and click "Bank Accounts" on the right.
3. On the next screen, click on the "Add Bank Account" button.
4. In the next window click "Continue", then "Maybe later".
5. Choose your bank in the list or enter it in the search field.
6. Verify you're not a robot.
7. Depending on the bank you choose, you may be asked to click on the "Continue to login" or enter your internet banking credentials directly.
8. Follow the instructions and choose the account you're like to add.
9. Once the account is added, a window will popup saying "Sucess. Your account has been successfully linked to Dynadot".
10. Click on the "Continue" button, you will be brought back to the page and your bank account will show up.

You will be able to use your account to register new domains, set your domains to Auto-renew, set Autopay and add proxy bids for your auctions.