So at the back under the water tank should be a white(ish) connector with nothing attached. Stick a multimeter into it (one prong into each hole in the socket) and check the voltage, it should be zero, then turn on the fog lamp switch and check again, should be around 12V.
If i remember rightly there are just two wires going to the connector, a positive and a negative. Using normal lighting wire (from halfords) you need to split these two wires into four so that you can run a positive and negative to each of the fogs. Imagine a 'Y' split for each wire, doing it properly i would get some bullet connectors or something to attach it all together with.
When you have a positive and negative wire going to each of the fogs you will need to solder them onto a bulb socket. Easy enough. I can't remember which one it is... I think its a H3 type but someone will be able to confirm i hope. Once you know which one it is, get a connector (prob from Halfrauds or an autoelectrician) solder it on and connect up.
