Note: You must already have Enterprise Access to edit users and their permission
If you have a User that's already in the system but needs increased access and permissions to use Enterprise, follow the steps below. Keep in mind that this can only be done by a Spoonfed Team Member, not a User or Customer.
Login to Enterprise Account.
Go to the Enterprise Page.
Search Users.
Select "Independent Users"
Select the User who needs Enterprise Access.
Assign User to Enterprise.
Choose which Sites the User will have access to.
Choose User Permissions.
Click Save.
That's how to add an existing User to an Enteprise Account!