On Amazon, a neutral brand (Amazon Private Brand) is a brand produced and sold independently by Amazon. If you want to list your products under a neutral brand, you need to follow these steps:

1. Log in to Amazon Seller Center and select "Add Product".

2. On the "Add Product" page, fill in your product information, including product title, description, price and other details, and upload product pictures.

3. Select the category and subcategory to which your product belongs. If there is a neutral brand category in the category and subcategory to which your product belongs, you can select that category.

4. In the "Brand" column, fill in "Amazon Private Brand" as the brand name of the product.

5. In the "Manufacturer" column, fill in "Amazon.com, Inc." as the manufacturer name of the product.

6. Submit your product information and wait for review, then your product can be listed under a neutral brand.

It should be noted that neutral brands have strict requirements for product quality and service quality, so before listing products, it is recommended that you carefully read Amazon's relevant policies and requirements and ensure that your products meet the relevant requirements. At the same time, it is also necessary to ensure product quality and after-sales service to improve user experience and reputation.