1. Log in to the JD merchant backend, click "My Store → Store Management → Business Qualifications" in sequence, and click "Modify" here to update industry qualifications and add categories.

2. After clicking "Modify", you can directly update the category qualification information. Click "Add" to select the corresponding secondary and tertiary categories to be added according to the current main categories, and then upload the corresponding business qualification information according to the current operating categories and the newly added categories. The modes currently allowed to apply for new categories include SOP, FBP and Global Shopping merchants. Among them, merchants whose main categories are fresh food, agricultural supplies and green plants, computer office, art, auctions, local life/travel and real estate are temporarily not open to online application categories.

3. After selecting the category, click Submit to view the status of the review and the submitted categories and qualifications.

4. If the application is rejected, you can click "Modify" to modify and update it according to the reason for the rejection, and then resubmit it for review. The new category can be enabled after the quality control review is passed.

To add a category on JD.com, you can follow the steps below:

1. Log in to your JD.com seller account.

2. Find "Product Management" on the top navigation bar and click it.

3. On the product management page, click "Product Release" in the left navigation bar.

4. Then click "Add Product".

5. On the product release page, you will see a "Category Selection" section. You can manually select an existing category or click the "Add Category" button.

6. If you want to manually select a category, you can enter relevant keywords in the search box and select a matching category from the results.

7. If you want to add a new category, click the "Add Category" button and a dialog box will pop up. You can fill in the relevant information of the category in the dialog box, such as: category name, parent category, etc. Then click "OK" to add the new category.

8. After adding the category, you can continue to fill in other information of the product, such as title, price, inventory, etc.

9. After filling in all the information, click the "Submit" button at the bottom of the page, and your product will be added to the corresponding category.

Please note that adding a category may require certain permissions or qualifications. If you do not have permission to add a category, you need to contact JD customer service to understand the specific requirements and procedures.