Fax software poses puzzling user problems

I recently purchased an iMac. I used to have a PC and am relatively new to the Mac environment. I am having a problem using the fax program (Smith Micro's FAXstf X.)

According to the instructions, when I choose 'Add Printer' I should be able to see the fax program and add it to the printer list, however, this does not appear. What am I missing?

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