Hi Rex,
You have an LED in there so it is easy to find with a multimeter set to measure the forward voltage drop across diodes. The LED will measure about 1.3V.
With the LED conducting a few milliamps through a current-limiting resistor you can detect the polarity of the collector and emitter by connecting a power source of 6V or less (to avoid an excessive reverse emitter-base voltage if you connect the polarity backwards) in series with a current-limiting "collector" resistor. The transistor will probably conduct a little even with reversed polarity but will conduct much more with correct polarity. Turn the LED off and on a few times to make certain that the transistor follows it.