If you look at YouTube, you have a pick or a weapon, but I can not. If you press the E button, it will not be installed. It will not be able to fire firewood or minerals. Please answer fast.

Hey dongwon,

I'm sorry but i'm having trouble understanding your issue. 

You can only pick up a newer version of the tool you have equipped. So if you have a Copper PickAxe, you have to Equip a Tin or higher Pickaxe. 

If you have none then pressing "E" will pick up a tool. You can only equip a PickAxe, Axe or Hammer as tools. 

the 4th tool slot is for your lantern, located above your work bench