Ma per selezionare il bersaglio devo tenere la bomba in mano?
Yeah you hold the bomb in your hand while setting the source, and then after you've set the source, you place the bomb as a structure by right clicking. All structures that require a source or a target work like this, so things like the logic gates. The bomb can also be put inside the press to automatically detonate it.
I don't have the capacity at the moment to make a full tutorial of the game, but if someone wants to take that task upon themselves, go for it.