1. Enter the "self-service borrowing and returning machine" from the security door.

2. After entering the "self-service borrowing and returning machine", click the "Return Book" option.

3. Put the books to be returned (no more than two) flat in the book sensing area.

4. When the self-service borrowing and returning machine prompts "Book returned successfully", the current number of books returned will be displayed at the bottom left of the screen.

5. After returning the books successfully, readers need to put them on the book cart next to the "self-service lending and returning machine". The staff in the museum will sort it out and put it back on the shelf.