How do I remove objects from scene

Ok, so let’s start from the beginning. I need to create/clone an object with each click of first button and insert it in a single list of cloned objects and then remove each item from that list (and thus from the scene) one by one with clicks on second button. So far solutions I came up with don’t produce expected results – what am I doing wrong? I am not a coder so can’t really think like one, so please help out if you can, it would be much appreciated (and I will get a license, I promise ). Puzzles below.