A password box is the same with a text box, but whatever is typed is hidden by asterisks or bullets. If you want to create a password box type the following in your favorite html editor:
password:<input type:"password" name="password" size="10" maxlength="10" />
In size and maxlength you can put anything you want. Size is the length of the box and maxlength the maximum characters that can be typed in the box by the user. Note that the information typed in a password box are hidden, not encrypted when sent to server.