you have to put them so the arrows are on the two things you want to connect, you can rotate them with R, there is a triangle indicator for the direction, but you are not the first being confused by this, maybe i should have shaped it more like an arrow!
a friend of mine who is not familiar with the genre was confused too by this hahah, but it's nice feedback to know, we should always stride to make our games as intuitive as possible, thank you for playing ^^
Yeah I managed to give him fish after all after playing again, thank you for hints… xD It makes me think this game is similar to a puzzle game, which is pretty cool, yeah maybe just ppl new to genre need more directions than usual :)