To sign a PDF, you must have a digital ID first. You can make your own digital ID or obtain from a third-party Certificate Association. To sign a PDF, follow the steps:
- 1. Click Protect>Sign Document.
- 2. You need to add a digital ID first. In the pop-up windows, please select a existing digital ID from a file or create a new digital ID.
- 3. Set your password.
- 4. Finish.