Make sure on the assign controller page that you see the controllers in the center, then move them left or right for player 1 or player 2. What controllers were you using? I'll check them out when I get the chance.
player 2 by default has no key binds for the keyboard and has to manually make those in the settings menu (the cog on the bottom left in the title menu). Go to 'controls' -> 'keyboard' and from there you can bind your keys. Make sure you have a key for jump and roll as that's the confirm and back buttons.