Taobao Express is a paid promotion tool on the Taobao platform. It increases store exposure and conversion rate by placing advertisements to target groups. Here are the steps to open Taobao Express:

1. Log in to your Taobao account, enter the seller center, select "Marketing Center" on the left, then select "I want to promote", and then click "Taobao Express" to enter the Express homepage.

2. On the homepage, select "Promotion Plan", click "Standard Promotion", then click "New Promotion", select the name of "Direct Sales Plan" in the name column of "Promotion Plan", and click "Submit".

3. Click the two options "Promotion Plan" and "Standard Promotion", and the created promotion plan will be displayed on the right. You can set the daily advertising fee limit, delivery time, budget, keywords, etc.

4. In the process of creating the plan, you need to design the advertising content. You can choose to upload pictures yourself or use the advertising material library provided by Taobao. After the design is completed, click "Submit for Review".

5. After the review is passed, you can start the promotion. In the two options of "Promotion Plan" and "Standard Promotion", select the promotion plan, then select the product to be promoted and edit the creative content.

6. After completing the above steps, click "OK", and then click "Finish Promotion" again.

Please note that the actual operation process of the through train may be more complicated and requires continuous learning and experimentation. If you have any questions or need help, you can consult Taobao's customer service or professionals.