That's correct. Login with your wife's user name and pwd. Notice the message in the "No Brainer" page. It says:
A confirmation message has been sent to the forwarding address you specified. You'll need to click on the link in the message to confirm.
You must save and confirm your real email address to have messages delivered to you.
Until you do, all messages sent to your disposable addresses will be eaten.
The forwarding address box should be blank. Type your correct forwarding address and click "Save". Now a confirmation message is sent to the address you entered. Open it and confirm. That's it.