Thanks for trying it! I need to put in a demo round, but in short, the four "buckets" at the bottom of the screen are the piles for each suit. Your job is to stack the cards in order lowest to highest or highest to lowest.
Let's use spades as an example. At the start of the game, you can select any spade and that will start the bucket. Looking at the "Refine" section of the bucket will tell you which two cards are 1 lower and 1 higher than the card you selected. Those are the two targets to refine next.
I usually start with the "2"s for each suit. and work my way up. However, as you progress thru each file, more decks are added. So, pay attention to the suits as you hover your mouse over each one.