There is a place in the TAB menu to setup the player one and two sticks for player one in dual-stick games.
Player 1 stick is LEFT, Player 2 stick is RIGHT
You will see LEFT/UP, LEFT/DOWN, LEFT/LEFT, LEFT/RIGHT -- these are player 1 stick first, and the direction you need to press second. Do the same for the player 2 stick (RIGHT/UP, RIGHT/DOWN, RIGHT/LEFT, RIGHT/RIGHT)