American Airlines requires 3 login fields.

My American Airlines login requires 3 fields: 1)AAdvantage# or username, 2)Last Name, 3) Password. I cannot figure out how to get 1Password version 8 to accept all 3 fields. I am using Windows 11, and 1Password extension in Microsoft Edge. Please help. Thank you.

1Password Version: 8.10.9
Extension Version: 2.13.0
OS Version: Windows 11
Browser: Edge