Camelot, x10 does not make any heating controls. The best I have seen from them is a thermostat setback controller which is just a little box that gets mounted under your thermostat that fools it into thinking it is warmer than it is.
First off, to get you SOME temporary heat. open the panel on your furnace and look for where a set of colored wires are attached. Look for a red and a white wire. This should be 24 volts AC (red wire), and heat (white wire, may be connected to a terminal labeled W, W1 or W2). If you have a volt meter , check between the red wire and either a blue, black or brown wire. If you read 24 volts there, take a short piece of wire and connect between the terminals where the red and white wires are connected. This should turn on the heat stage of your furnace. If you want for now you can connect a switch between these two until you get this figured out.
Here is some information on furnace wiring and how to figure out the other wire colors if you need toNOW, follow the set of colored wires that you found in the previous step. See if they go to some other kind of box/controller. If so, see if you can find any kind of brand or model number on it. If you find such a box, see if there are any other wires run to it, and where they go. You may find that they run to your homebase controller. If so, you may want to just wire in a thermostat yourself.
Here is some info on wiring in a thermostat should you need to go that route.
I hope some of this information is helpful.
Dan Bemowski