These steps may help you to add/delete the new or existing products,
1. Login to your Magento admin panel.
2. Go to Catalog >> Manage Products, in here you can add/delete the products.
3. You need to select the product’s settings (Attribute Set and Product Type).
4. In that you have to fill in the product options (Name, SKU (Stock Keeping Unit), Weight, Status (Enabled/Disabled), Tax Class, etc).
5. You can also add custom attributes to the product using the Create New Attribute button.