how to use flashcard function

I just purchased the flashcard add-in, but am having trouble understanding how to get to to function.

Viewing imported flashcards.
I imported text files of some flashcards from this site via wifi. How do I exactly move those to my 'flashcards' section?
When I go to pleco > file manager, I see the file there. when I tap on one of the files, it says I need a reader add-in in order to view the file. Did I do this right or do I need to purchase another add-in?
Hi semidevil,

it isn’t necessary to purchase the Reader for that; you can choose Import Flashcards and then select the file to add it to the flashcard database.

Cheers, Shun