After you click on the [UNIX] button, you will be shown a screen where you can enter the encrypted UNIX password.  You need to enter the 13 character string obtained from the /etc/password or equivalent database.

If you want to use a UNIX example instead of getting a real live target, choose Help -> UNIX Examples to get to the following screen.

Select the text and hit the copy button.  When back at the UNIX screen, hit the paste button and the example password will be entered for you.

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