To open a showcase for a Douyin personal business license, you first need to make sure that you have completed corporate certification. This step requires submission of relevant documents, such as identity proof, company business license, tax registration certificate, etc., and the showcase can only be opened after being reviewed and approved by the platform. Next, enter your personal Douyin account, select "Personal Center"-"My" page, click "Business License" to enter the certification page, fill in the certification information and upload relevant materials. After completing the certification, enter the "My" page again, click "Showcase" to open it, fill in the store information and product description and other content as required, and finally submit it for review. After opening the showcase, you can display the store name and products on the homepage to attract more users to pay attention and purchase. At the same time, Douyin also provides a variety of marketing tools and promotion methods to help merchants better promote their products and services.