Press left/right on the title screen to switch between different keyboard layouts. There are tutorials in-game that should tell you which keys to press (these will show controller buttons instead if you have a controller plugged in).
Here's a quick reference of the action keys on the different keyboard layouts:
| Qwerty | Qwertz | Azerty | Dvorak | |
| Grab / poke: | X | X | X | O |
| Throw: | C | C | C | E |
| Ground pound: | Z | Y | W | A |