Reinstalling is the same process as the other devices - you use the OSMC installer on Mac/Windows/Linux to download and install an image on an SD card. You then boot the Vero 2 from the installer SD card and it will format the internal storage and reinstall.
Once it has finished unplug the power and remove the SD card then plug the power back in. Unlike other devices like the Pi that boot from the SD card all the time the SD card is only used for re-installation on a Vero 2.