Go to Configuration > Volume Manager then go to the Unit Manager, here you should see the Status of the Volume Groups. If not try the Rescan button above. Then select the Unit to add to existing VGx or create new Volume Group. Now you should have the vg00 or vgxx on the left panel, click on this to access the Volume manager. You should have your space available for use. If this is NAS-R3 Enterprise please place in the proper post for future. Thanks!