In Settings – Security – Form Password Protection you can set a password for your form. Share it with your target audience and forbid access for other submitters.
Tick the checkbox and type a password in both textbox fields and you’re ready to go.
Note: The password cannot exceed more than 15 characters.
To make your form available to everyone, deselect the option. This option is available on paid plans only, such as Apprentice, Master or higher.