Is there a way to add another user to this?

If you are referring to a sub-user, that feature is only available in Jotform's Enterprise plan. You may check this guide https://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User for more information.

If you are looking for sharing your form with another users, there are other ways you can do to achieve this. You can try the assign form feature https://www.jotform.com/features/assign-forms/.

Let us know if you have any questions or if you need further assistance.