Remove the lower leaves,and dip the end of the cutting in rooting powder/gel (optional) then insert it vertically in pots/trays filled with moist seed/cutting compost.
Place the pot / tray in a warm place, preferably with bottom heat.
A soil temperature of around 16°C (60°F) and a minimum air temperature of 4°C (40°F) is ideal.
Give the cuttings plenty of light, but ensure that they are not scorched by direct sunlight.
Spray cuttings at least once per day with either fresh water or a fungicide mixture to prevent dehydration.
A sign that they have rooted is, the growing tip will be a ‘fresh’ green colour.
Pot on into 75 mm (3") pots of potting compost when rooted.