Equipping an item
The club has now been added to your inventory. You can view your inventory by clicking the bag shaped button in the bottom right of the screen or by pressing the "i" key once this window has been closed.
Now, you will equip the club. Close this window, then open your inventory window. Find the club in your list of items, then right click on it and select "Equip". Alternatively, you can drag then item up from your list of items to your main hand slot.