Due to the modern design of Springwave showers, they require very little if any sealant.  Ensure that the unit is completely dry, and free from dirt or grease.  Apply a neat bead of sealant along the rear bottom side of the glass back panels.  This is all the sealing that should be required, but please fully test the unit before you push it into place.  When installing the shower, the tray must be 100% level to ensure no leakages in the future.