anyone know how to care for a poinsettia?

bright spot, no direct midday sun, and away from radiators and draughty doors - they drop leaves the moment they get cold or blasted with dry heat. take the foil wrap off or poke holes in it so water drains, they hate sitting wet. water when the top of the soil feels dry. if you want it to colour up again next year it needs about 14 hours of complete darkness every night from early autumn for a couple of months. most people don't bother, but it does work.