QuickStart Wizard - Step 4
Setting up password protection

You can restrict access to your files and folders by creating user names and passwords. Users who visit your site and wish to access your files will need to enter a valid user name and password.

Click the Manage tab
Click the Define users link
Create one or more users then click the the Manage tab again
Click the Password-protect files link
Select files that should be protected

After defining security, press the Next button, below.