I don't have this product, however, if you are trying to apply shaders, not materials, you need to select the object in the Scene tab and select the material zones to apply the shaders to in the Surfaces tab, under Editor. All Iray shaders work that way. (Probably 3Delight shaders as well, but it's been a very long time since I used shaders in 3Delight.)
Comments
I don't have this product, however, if you are trying to apply shaders, not materials, you need to select the object in the Scene tab and select the material zones to apply the shaders to in the Surfaces tab, under Editor. All Iray shaders work that way. (Probably 3Delight shaders as well, but it's been a very long time since I used shaders in 3Delight.)
I hope this helps.