We have a variety of places to light a candle with your prayers.
As previously said, if looking at the iconostasis, to your right is for the living, and to your left is for the departed. However, I don't think that is written in stone anywhere. God hears your prayers, no matter where you say them.
We have little glass votives - blue/red, large glass candles (last all month) and the skinny beeswax candles.
We do not light ours in the narthex, but, actually up front, near the iconostasis. There are a number of brass candle holders for the tapers and tables/stands for the glass votives.
However, I have often seen the sandboxes in the narthex. Our narthex is simply too small to accommodate even an icon stand, much less a location for candles.