If you want you can have a password for your form. Only the people who have this passport would be able to submit the form. Here is how you can enable it.
Go to
Configure
tab.Click on the
Password protection
option.Switch on the toggle button for password protection.
Enter the
password
in the password field of your choice.Click on the
eye icon
to view and verify your password.Click on
save changes
button.Your form is now password protected.