You can easily add a password to a PDF document from the "Protect" tab. Here is how to safeguard your files in four steps:
1. Open your MobiPDF document and click the Protect How to password-protect a PDF.
2. Select Protect Document and confirm with OK.
3. Type your password and choose which restrictions the password will apply. Confirm with OK.
4. Choose where to save your password-protected file and confirm with Save.
