How to configure samba 3 with Windows AD

Hello,

I need some help with configuring Samba 3 with Windows AD.
All what I want is to share a folder, give permission to Windows Ad group to be able to access the shared folder.
I am using RHEL 6.9 fully patched. the server is already AD joined.
I installed SMB, NMB and Winbind.
I already reviewed this solution https://access.redhat.com/solutions/43065 but no luck

Can someone please help me with this?

Best regards,
Qusay Jibrail