Not sure what you've added to that page but you are using classic sites and web parts here, which don't work the same as modern news webparts etc.
You have some form of a list that has these columns that you need to modify, if you go to site contents, you'll see all your lists, your web parts you are adding have to be based off these lists so you have to find out what one you added them for. then edit and find the columns there when editing the list.