This depends on wether your spectrometer has additional set up arrangements of complements and software for Difussion Reflectance, as well as other sample holders to exchange. With the set of integrating sphere it should be possible to perform Specular and/or Diffuse Reflectance Spectroscopy.
Basically, it is just to see in the instructions manual of the instrument which compontents or sample holders to exchange, and also which parameters to modify in the computer program for the measurement.
In these links you can have an overview of videos about this sort of measurements using a similar UV-Vis-NIR spectrometer with integrating spheres: