Hello,
Please check the following links for detailed information on how to set the My Cloud on a MAC.
http://wdc.custhelp.com/app/answers/detail/a_id/10439/session/L2F2LzQvc25vLzEvdGltZS8xMzg5MjE2ODUzL3NpZC9DRTVmNFVKbA%3D%3D
http://wdc.custhelp.com/app/answers/detail/a_id/2686/session/L2F2LzQvc25vLzEvdGltZS8xMzg5MjE2ODUzL3NpZC9DRTVmNFVKbA%3D%3D