It is recommended you have your own HECore asset for your game.
The addon contains a custom HECore called HECoreQuickSlots as a reference.
For this, you need to add QuickSlotsAssigner prefab into the UIInventory prefab.
However, it is recommended you create your own inventory prefab variant (or any prefab included in the template you modify) to avoid losing changes when updating.
The addon contains a custom inventory prefab called UIInventoryWithQuickSlots as a reference.
Additionally, assign UIInventory and ContextMenu references on the QuickSlotAssigner component.
Quick slots are triggered by using the DPad. This conflicts with DPad movement so it needs to be removed.
Alternatively, you can change how the quickslots are triggered in the asset QuickSlotsActions.