Solder the red battery snap lead wire to the (+) end of the voltage regulator and the black lead wire of the battery snap to the (-) end of the voltage regulator. Notes:
Ensure you do not cross wires during the soldering process as it will short the connection.
Do not hold the soldering iron to the voltage regulator for extended periods of time, as prolonged temperatures of 150+ degrees C will damage the regulator.
The tutorial mentioned in the introduction page about soldering can be found at this link: http://blog.makezine.com/archive/2007/01/soldering-tutorial-make-v.html