Step2: Change password settings
Select "Password" tab page on the main window. There are two password mode to protect files, you can select one you like.
1. Single password mode:
Just input a password which you want to use to protect files, after protect, the
visitors need to input this password to enter the files.
2. Multiple user name and password mode:
Press 
"Add User" to add user name and password to protect files, after protect,
the visitors need to input one of the user name and password to enter the files.
See Also
Step3: Change protect settings