How can I add a user?

You can add sub-account user from your account settings.

Go to: https://www.jotform.com/myaccount/users

From here, you can add users and give them access to your forms to view submission or edit form.

To know more about it, please refer to this link: https://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User

Hope this is what you are looking for.

If you have any further query, please let us know.