I know this is a little outdated and old, but originally came to this thread hoping for an answer and it wasn't here. Found the answer elsewhere and figured it would be helpful to share it for future reference.
Domain URL:
The Active Directory LDAP URL should enter here. FQDN of domain controller - for example dc.contoso.com
Authentication Type:
If the field is blank, the application will treat it as ‘Secure’ - can be left blank
User Groups:
An administrator can restrict the access to Kiwi Web Access to a specific domain user groups. Multiple user groups can be provided over here (separated by ;).
AD user group
In order to login with AD credentials, you have to put in your domain\username as the login username in the web portal. This will log you in, and set up a user account as a standard user. If you want to setup a domain user account as an administrator, you can do so by going into the account maintenance, click add new account, set the username as domain\username, put in a temporary password, and apply the administrator role. Once that is setup, the domain user can login as domain\username as an administrator.