In addition to adding a Product, you can edit or delete it.
Go to the Products screen via the Sails & Products menu dropdown at the top.
On the Products Screen, you can see all the products you've added.
If you want to edit or delete any of them :
Once you are in the Edit screen you can amend any of the details, price, image, etc
After editing you will need to click the Update button on the right side to save all changes.
From this same screen, you can also delete a product entirely if required by selecting the red X Delete button.