If you want to change a personal Taobao account into a merchant account, you can follow the steps below:

1. Log in to your Taobao account: Use your personal Taobao account to log in to the Taobao official website.

2. Enter the merchant center: Find the "Seller Center" entrance in the upper right corner of the Taobao homepage and click to enter.

3. Apply to open a store: On the merchant center page, click "I want to open a store" or a similar button, and then fill in the relevant information according to the prompts, including the store name, business category, etc.

4. Complete the store information: According to the requirements, complete the detailed information of the store, including store introduction, store logo, store operation plan, etc.

5. Submit the application: After confirmation, click Submit Application and wait for review.

6. Approval: Generally, Taobao will review your application. After the review is passed, your personal Taobao account will be successfully transformed into a merchant account.

It should be noted that the specific operation steps may change due to the update of Taobao platform. It is recommended that you read Taobao's instructions and tips carefully during the operation. If you encounter any problems, you can consult Taobao customer service or refer to Taobao's help documents.