JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
You have to add the email address in the form email settings. Here's how our guide for that: https://www.jotform.com/help/39-Send-Notifications-to-Multiple-Recipients.
Please note that there is a limit of 10 recipients per notification email. If you need to add more than 10, you have to create a new notification email.
Lastly, there's no need to add them as a sub-user account.