1. Open the PDF file, and then click Insert in the PDF.

2. Find the PDF signature in the inserted option bar, and then click this option.

3. Find the official seal to be added in the computer, and choose to add this official seal to the PDF.

4. Click Add New Item to the right of the target stamp set, and then go to the next page.

5. Change the name of the picture on this page, and then click OK.

6. Then double-click the seal, click in the area where the official seal is needed, and the seal will appear in the document.