Add/Edit/Delete Product List.
Expand "System" tab and click on "Product List".
On the product list page you can either view, edit, delete or add new Products, but in this case we are editing so click the "Writing Icon".
Once on the edit product page make any necessary changes and click "Update Changes".
All the same process with "Sales Type List" and "Solution List" just go with their corresponding pages in System, find the item to change and click the "Writing Icon" edit button.