Task: In the Xodo app, Set a password "123456" to temp pdf
Steps:
Open the Xodo app
Click on the three dots in front of temp pdf
CLick on the  Lightning bolt symbol 
scroll down to view more options
scroll down to view more options
Click on the Protect PDF
Click on the Input Password box
type 123456
Click on the Confirm password box
type 123456
Click on the PROTECT  button