|Moving & discarding cards
Use drag-and-drop to move cards around. You can drop cards to squares on the grid, or to the priorities stack or subcards stack within a card (above and below the grid, respectively).
You can drop cards onto the black background and they will be discarded from the current card. Discarding will not delete the card, just remove it from its present location. You can drag on the black background itself to grab the most recently-discarded card back (it remembers all the cards you discard locally until you refresh the page).