Press E to open and close the inventory To add items press "See inside" and go to the sprite called Inventory and drag the pink block called Add and put a number between 2 and 8 in the empty value To stack items press the Stack Button beside the crafting menu. to unstack press space while touching an item to un-stack it.
Thanks to Funut for creating the inventory system and crafting system. Thanks to Pixel Destroyer for Text Method. I created the stacking and unstacking system