This post was made to answer requests found elsewhere ...
For the cards, they have a purple hallow, showing that they must be played (in the normal game too) once received.
Click on the card that is purple-flashing and drag it on to the green card-shape located on the middle-far right of your screen, just outside the map...and that'si it.
As for the PDF manual, you can find it in the Options of the game, Rules section. Or you can download it from the website, here: https://drive.google.com/file/d/1N1WbrPpA89aJ34YZLezajGPTBJ1GQXFq/view?usp=sharing
Hope this helps