You can try the demo (head to https://www.machform.com and click on Try Demo up at the top) and try creating users etc. As you will see, there is at present no option for multiple levels of administrator. An administrator can create other administrators, or grant non-administrative users specific permissions for administering specific forms.
I would definitely like to see groups and permissions, to be able to add new users to a specific group and then only worry about their group permissions. But unfortunately this isn't something Machform supports at present.