Here you can see what they look like on the merch page.
When you first open the merch page you will see the six different products you can buy. When i am in the editing tool I can add new good or edit existing ones.
This is what the editing tool looks like.
When I click on a product it lets me add new or more pictures of the product and rename the product.
I can also change a lot of other things such as the price of the good, if the good is on sale or not, if the good is Out of Stock, the size on clothing and more.