ZBrushCentral

Ambient & Diffuse adjustment in OSX?

Can anyone point me in the right direction with regards to ZBrush 3.2 OSX?

I am trying to adjust the Ambient & Diffuse which according to the tutorial I am following are under Material/Modifier settings.

I think the tutorial is base on using a PC. I am using a Mac and Ambient/Diffuse are not listed under Material.

Can anyone tell me how to adjust Ambient & Diffuse under Material?

Thanks

All is well. Ambient & Diffuse found.