Give Player Grenade

First, the Input:Key node detects when the player pushes the 'U' key. We move from the Pressed port to the first input port on the Logic:Once node. This will ensure that we only give the player a grenade the first time they push the key down.

If the logic gate fires, we use the Inventory:AddItem node and give them a FragGrenade.

If you want to keep giving them a grenade each time they push the key down, just remove the Logic:Once node and directly link the Input:Key node to the Inventory:AddItem node. You can change which key they need to push by changing the value of the Key input node on Input:Key. You can also change what item they receive by changing the Item input node on Inventory:AddItem.

This will show you how to give the player a grenade when they push the 'U' key.