How to delete a product
If there's no button to delete a product, it's because you cannot delete it.
This happens if there are any transactions out there which may lead to money changing hands. Sometimes it takes a while from a transaction is initiated until we get notified that payment has gone through. If the product's gone, then we don't have anywhere to put that information, and we may have money that we don't know what to do with. We can't let that happen.
So if you can't delete the product, then you can at least hide it.
On your products listing, when you click Products in the menu on the left, you'll see that there's a star on the far right side for each product. Click that star, and it turns hollow. Reload the page, and that product will have been hidden from the list.
If you need it again, it'll be under the link "Hidden products".