The primary user for a business can use this screen to grant access to other users. You need to know the user name of the person to whom you wish to grant access.
Note that users names are case sensitive so it is possible for users "smith" and "Smith" to exist. Take care to ensure that you have the correct user name. If you make a mistake you can revoke access via the menu option Business||User Access||Manage Existing Access.

A unique user name is required in order for you to be able to use the application. User names can be a maximum of 25 characters, are case sensitive and can be a combination of letters and numbers.