Where should I set the password!

Hi,
I find this module simple and easy to use so I decided to use it.
I follow the instruction and installed on my site which runs drupal 7.16
I enabled the module and then create a node type let call it "private info".
Then I create a realm "private info access" and set the node type to "private info" and allow all users to see the node with the password.
On the thrid step I then created a node access password field for the content type and rebuild the permission.
and at last Created a sample node and checked the Password field.

The funy thing is that I do not where to set the password and what the password is!
Where should I set the password?