I'm assuming you are using the Nvidia Iray Engine (in render settings)? As your screen shot indicates, the imported object's surface material by default uses the Daz Studio default surface/shader/material. Select the object. Select the Surface. Go to: Content Library > Shader Presets > Iray > DAZ Uber and double click on !Iray Uber Base. Hope that helps.

Oh, and save your eyes change your interface color scheme to something more neutral and legible