get some thin wire (like IDE cable strands), cut off about 2-3 mm of the plastic. twist the copper strands together, then cover them in a bit of solder by sliding them through molten solder on the tip of the soldering iron. then look for a solder spot on the pcb (a round point that already has solder on it, i.e. where connectors are soldered to etc), then hold the tinned wire tip against it, heat up the wire with the soldering iron till it melts to the spot. the connection is good when then wire is covered with a bit of solder (don't use too much, you need very little when solder is already existant) and doesn't come off when you tug at the wire.