When you have the hammer selected, right click and hold and there will be an option of several things you can build.
Oh my goodness, I have been playing for over an hour trying to figure this out. How would someone ever know to RIGHT CLICK!?
Please, please, please, make a tutorial for the game. It is a good base for a game and I have been enjoying it. Keep it up.
I've a YouTube channel with some videos, feel free to check them out
