To enable one-click purchase in Alibaba store, you need to complete the following steps:

1. Register an Alibaba account and log in.

2. Enter the Alibaba management backend and find "Store Settings" in "Store Management" or similar options.

3. On the store settings page, find "One-click Purchase" or similar options and click to activate.

4. Fill in and set relevant information according to the prompts, such as store name, business scope, contact information, etc.

5. Complete the store information and ensure that accurate contact information is provided to facilitate communication with buyers.

6. After submitting the application, wait for the platform to review, which usually takes several working days.

7. After the review is passed, your store will successfully enable the one-click purchase function.

Please note that the above steps may change due to platform updates. It is recommended that you log in to the Alibaba official website or consult customer service to learn about the latest activation process and requirements.