Use the holes provided in each connect bracket to fix the lighting grid to a ceiling or wall. Depending on the surface you are fixing you, you may need to install wall anchors or similar beforehand.
Each lighting system can also be drop hung from the ceiling. Use the same mounting hole in each connector bracket to mount it to a ceiling hanger. Use a ceiling hanger that is suitable for the weight and application. Ceiling hangers or similar substitutes can be purchased from your local building hardware supplier.