How do I send a notification or confirmation when someone has submitted a form?

The steps differ depending on whether you have the module Campaigns or not.

If you do not have the module Campaigns, you connect the notification and the confirmation in step 4: Follow-up emails at the module Messages.

If you do have the module Campaigns, you first create a campaign. The form is the trigger for the confirmation and the notification. As campaign steps, choose Send email and Send email notification. Then select the corresponding messages.