To associate a source of goods in Douyin Store, you can follow the steps below:

In the "Goods" module of the Doudian backend, select the "Product Creation" or "Product Management" option.

In the product creation or management page, select the "Add Product" or "Add New Product" button.

In the pop-up product information filling page, fill in the basic information of the product, such as title, description, price, inventory, etc.

In the product information filling page, select the "Associate Source of Goods" option.

In the associated source of goods page, select the source of goods to be associated, and fill in the relevant information of the source of goods, such as source link, price, inventory, etc.

After confirming that the information of the associated source of goods is correct, click the "Save" button to complete the association of Doudian goods and sources of goods.

It should be noted that the association of Doudian goods and sources of goods needs to ensure the stability and reliability of the source of goods, so as to avoid the situation where the goods cannot be sold normally. At the same time, when associating sources of goods, it is necessary to carefully check the product information and source information to ensure the accuracy and consistency of the information.