I should update the control screen. It is somewhat outdated. Here is the official control list:
Button is the generic button name. It coresponds to generic controler buttons. If you are playing on a keyboard and the game says "press the R button", then you have to press "W" or "Page Down". Bear in mind that sprint speed at the start of the game is really slow and barely faster than walking.
If you press F1 in game, you can change these controls a little bit.