How do I add an item to my inventory?

Could anyone describe in more details, please, how to connect Structure and actors arrays with inventory widget which has widget slots to spawn an item there.

I am a newbiew to blueprints and does not have C++ skills. I just followed this official guide Drag & Drop with UMG | 02 | Live Training | Unreal Engine - YouTube to create my inventory but can’t figure out how to spawn item in inventory instead of picking it up.