Inventory help

I have never really created an inventory system and im not sure how to do it. When i craft an item or pick an item up i want that item to go into my inventory by replacing the “Empty” text Screenshot - a2a8c78d513af5cd189c87bb29d4e15c - Gyazo
and also make it so i can click the item in the slot any idea how i could achieve this

Have you watched the video series on creating an inventory using UMG? That is a really good tutorial on how to do an inventory. You should be able to figure out from there how to get it to display on your screen the way you want.