A store administrator is a person who is responsible for store management and is designated by the seller who owns or manages the store. The store administrator needs to manage all aspects of the store to ensure the normal operation and sales of the store. Specifically, the main responsibilities of the store administrator include the following aspects:

1. Product management: manage the products in the store, including listing and removing products, editing product information, setting product prices, discounts, etc.

2. Inventory management: manage the store's inventory to ensure that the quantity of products is sufficient to avoid out-of-stock situations.

3. Order management: manage the orders received by the store, including confirming orders, handling returns and exchanges, arranging shipments, etc.

4. Customer management: manage the store's customers, including responding to customer inquiries, resolving customer complaints, etc.

5. Data analysis: analyze the store's sales data, understand the store's operating conditions, and formulate appropriate marketing strategies.

In short, the store manager is an important manager of the Pinduoduo store and needs to manage all aspects of the store to ensure the normal operation and development of the store.