It is an iray surface shader, so you select your hair object in scene, go to surfaces tab, if you don't have that panel open then open a new panel select surfaces, in the editor section of the surfaces tab select your hair item. Then you can select the parts of the hair you want to apply the surface shader to, then go to your Iray shaders presets and to the shader you want to apply and double click (left button) to select and apply the shader.
Comments
It is an iray surface shader, so you select your hair object in scene, go to surfaces tab, if you don't have that panel open then open a new panel select surfaces, in the editor section of the surfaces tab select your hair item. Then you can select the parts of the hair you want to apply the surface shader to, then go to your Iray shaders presets and to the shader you want to apply and double click (left button) to select and apply the shader.
Thanks for the help, I got it now, thank you again, Miwi.
Np, have fun.