How to add items in review

https://preview.redd.it/j9l7idv61tge1.png?width=591&format=png&auto=webp&s=87f0f6e43b27f70bdda50b3ac0347b878bc803d8

I see a lot of people adding items from other peoples inventories into their reviews to pretend like they own the items. Could someone tell me how is this done?