How many users can have 'admin' access to the forms?

Would like to know if you can have multiple accesses to the back end so multiple users can review and download submissions. 

Sharing the forms and submissions with the Sub Account Users is only available with JotForm Enterprise - https://www.jotform.com/enterprise/

With a regular JotForm account, you can share the submissions page or create and share reports. 

How to Share Form's Submissions Page

How to Create Form Reports in JotForm