How can I set up separate login for limited access

I am trying to create a new login for access to only one of my forms. 
How do I do that but I am the admin to be able to access all forms? 

You can invite a sub-user account to your account. The sub-user account can manage selected forms and submissions. For more information, please visit this guide: https://www.jotform.com/help/232-How-to-Share-Forms-with-a-Sub-Account-User

Let us know if you have any questions. Thank you.