How to save a file of data on raspberry pi using Linx? (see attached code)

[GRCK5000]

I am having trouble saving data to raspberry pi. The file I want to save is CSV file. I wrote a code that will write letter "A" to a csv file every time I turn on the LED. So I'm expecting to see Letter "A" in the CSV file. All I want to do is to be able to save this csv file on the raspberry pi, but I am not sure how to achieve it.

I came across this post https://forums.ni.com/t5/Hobbyist-Toolkit/Save-to-file-on-raspberry-pi-using-Linx/td-p/4131929  , but I am not sure how to go about achieving what they are saying. 

I'm not sure what to put in the file path. I don't know much about file path on the raspberry pi. Can someone please help?