Welcome to the forum. Unfortunately NOW TV isn't available on your smart recorder.
Have a look at the following list of supported devices as you might find you already have something that you can watch NOW TV on. If not, a NOW TV box is probably your cheapest option, although there is also a new NOW TV Smart Stick coming out in a fortnight for that might interest you.
If you do have another compatible device such as a games console, Roku, Chromecast etc that you want to set up, you can find more details here
Currently no Panasonic device supports the inbuilt nowtv app.
Here's a help guide linked below giving a list of nowtv supported playback devices.
Also, it might be worth considering the new nowtv smart stick coming out end of this month