If you are lucky to have a PC, http://glasgowcoachdriversltd.uk/te/ you can just use left and right buttons on your mouse.
If you have mouse or something like that, but you have no right button, you are to hold one of the modifier keys to emulate right button. Try one of these: Command ⌘/, Control Ctrl/⌃ or Shift Shift/⇧.
If you use touchscreen device, try to obtain right click by tap with second finger.
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Author and owner: Alexey
You have an idea? You know better way to do something? Found error or typo? Feedback is welcome. Enjoy the game!