Okey... first, you pick a leaf from your VFT. Pluck it off, making sure some white part is still intact at the base of the leaf, and lay it, "face" up, on top of a 50/50 mix of either peat and perlite or peat and silica sand. Make sure the soil is nice and moist before doing this! Sprinkle some soil on top of the base of the leaf (the whitish part), just enough to just barely bury it in the soil. Water it with the tray system, and eventually the leaf will send out roots and grow a plant from them you will have a new plant!
Good luck!
FTG