See this article if you aren't familiar with creating an amended return in Web1040pro .
Once you have completed an Amended Return in Web1040 Pro and are ready to transmit it, navigate to the E-File page. The Federal Return Type needs to be a type other than "Paper Return". (Note: if the original return was paper filed, the amended return will also need to be paper filed. It will reject if e-filed.) If the amended return bottom line is a balance due and the taxpayer wishes it to be paid by direct debit, select the return type "E-file: Direct Debit", then select the menu Taxpayer Bank Account Information and add or verify the bank info.
Next, select the menu Amended Return Information:
You will be asked about e-filing the amended return:
Select Yes, then select Save at the bottom of the page to continue to the Submission page.
At the bottom of the Submission page, you will see a new button Save and Transmit Amended Return:
Select this option to transmit the amended return.