You have an analog tape recorder, so you need an interface which will allow you to plug it into your computer. This kind of interface is sometimes referred to as a USB Audio Interface. I use a Tapco Link.USB, and it works well, but there are many out there to choose from - you can use something pretty simple, nothing fancy needed.
The interface will plug into your computer via USB cable, and then you will use RCA cables to plug the PMD201 into the interface. When you play the audio on the tape machine, you should be able to select the "USB interface" on your computer as your "input device" and record on the computer. Watch on the computer recording software for input levels (meters that show sound is coming in), and set them to appropriate levels, not too low, not too high (if there is a red zone, you want to flirt with it only on the highest levels) ... don't hit "zero" if your computer shows zero as the peak level for input.

Final Cut Pro is far to complicated for what you are talking about doing. Many computers come with software already installed that will make simple audio recordings like this.

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Good Luck!