Task: In the DeftPDF app, Set a password "123456" to test pdf
Steps:
Open the DeftPDF app
Click on the three dots in front of test.pdf
Click on the Tools
Scroll down to view pdf secure option
Click on the Protect tab in SECURITY section
Click on the Password input box
Input a password 123456
Click on the Require a password  input box
type 123456
Click on the Encrypt PDF
Click on the Encrypt PDF