To protect your form with a password, select the Protect
form design check box, and then type a password in the Password
and the Confirm boxes. Click OK.
To be able to send a copy of the form in e-mail, select the Send
form definition with item check box.
To have the form show only for replies to messages, select
the Use form only for responses check box.
Select other options that you want.
For Help on an option, click What's This? on the Help
menu, and then click the option that you want.
For more information about setting form properties, click
here