Gel: take the tray out of the sleeve, squeeze the contents into the tray. Open flaps on the sleeve along the pre-cut lines and re-insert the tray into the sleeve. Position the tray so it is affected by the airflow from the aircon or household fan (make sure it's somewhere not too easy to knock over). That's it, no plugs or Wi-Fi connection required. . 

Liquid: 30 minutes before bedtime spray your aircon filters or the inside surface lightly (don't forget to turn it off first) Mould affected surfaces: remove the visible growth with a wet cloth or sponge (wear a mask!) then spray the surface with Germxit Liquid (just 1-2 pumps, depending on the size of the affected area) so the Liquid covers all the spots. Remove any excess Liquid. Repeat the procedure again in 2 days. You don't have to wipe it off completely, Liquid will be active for at least 3-5 days..