To apply for a JD promoter, you need to go through the JD Union. The specific steps are as follows:

1. Visit the JD Union official website (union.jd.com), click "Free Registration" or "Promoter Application" to enter the application page.

2. Fill in the application information, including promoter information, contact information, etc., and you need to select the products or merchants to promote.

3. Wait for approval. The JD Union will review the application and generally give the review results within 3 working days.

4. After passing the review, log in to the JD Union system, obtain your own promotion link or promotion code, and share it with other users. Every time a user places an order to purchase a product through the link or code, the promoter can get the corresponding commission.

It should be noted that before applying for a JD promoter, you need to register and authenticate with the JD Union, including filling in corporate or personal information, contact information, etc., and you also need to bind relevant qualification certificates, such as personal or corporate ID cards, business licenses, etc.