Can I add other creators/people to my account?

Yes, you can share access to forms for editing and/or submission data.  Additional users would create their own account and you would share the form with them as sub-users:

https://www.jotform.com/help/232-How-to-share-forms-with-a-sub-account-user

Please note, there are limits to the number of sub-users that can be added for each subscription level.

https://secure.jotform.com/pricing