The card editor is pretty straight forward. If you have a lead project it will open as the default. Else you can switch from the pattern screen to this card screen with the button in the left bottom corner. And vice versa.
You can click the cards in the middle or use your keyboard. If you have chosen another language you can use that language for honors. With the tab-key you switch suit. The little black arrow indicates which suit you are entering.
If you have used cards for other seats, they will be disabled on the card buttons.
With the library function you can save or read a specific hand just like the pattern screen.