How to sign the electronic document PDF? It can be done through the lightning PDF editor, as shown below:

Step 1: After opening, select Open-Browse to add the file to the open form.

Step 2: After adding, select the "Open" button at the top of the interface, click "Sign File" at the bottom, and move the mouse to select the signature location.

Step 3: Select a certificate in the pop-up window, where you can create your own certificate, as shown in the figure.

Step 4: After creation, you can set the reason, location, contact information and permission of the signature, and click Manage to add a picture signature.

Step 5: Click Save after setting, and set the file name and storage location in the pop-up interface.