To successfully add a product to your catalog in Amazon Seller Central, follow these step-by-step instructions:

1. Navigate to Seller Central: Access your Amazon Seller Central account.
2. Go to Catalog
   1. From the top menu, navigate to 'Catalog'.
   2. Select 'Add Products' from the dropdown menu.
3. Locate your product: Use an identifier to find the product such as UPC or ASIN.
   TIP: Utilize Shortcut on Product Page: when browsing our product page, use the shortcut by clicking the 'Check if Gated' button next to each item. This will direct you straight to the 'List Your Product' page.
4. Ensure Ungating: Note that you must already be ungated for the product category in order to proceed with adding the item to your catalog.
5. Click 'Sell This Product': On the 'Add a Product' page, locate the 'Sell This Product' button and click on it.
6. Add Relevant Information: Enter all relevant information about your product. This typically includes:
   1. Contribution SKU: The SKU you want to keep track of the item
   2. Quantity: Required if you are going be filling your own orders.
   3. Offering Condition Type: The condition of the goods
   4. Merchant Shipping Group: The shipping rules you want to apply to the item
   5. Fulfillment Channel: Select if you are going to ship on your own (Merchant Fulfilled) or Amazon will ship (Fulfilled by Amazon)
7. Press 'Save and Finish': After entering all required information, click on 'Save and Finish' to complete the product listing process.