why isnt the render tools or photoview 360 available for me to use?

hi guys, I need help trying to render an object on solidworks 2017-2018. I assembled it and when I go to use any of the render tools, (eg. final render or render window) they are unavailable to me as an option. they buttons are grey in colour and I am unable to select them. can anyone help me??

SolidworksPhotoview 360