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Did you download the Drivers and INstall them? Im assuming you did....but i just need to check.
Also....what DAW are you using?
It wont brodcast through the speakers......that is called pass through....and if you did that....you would probably get a ton of feedback.
Have you tried to see if you get any level input on your DAW?
Have you tried to record using yoru DAW, and the mic input.....i bet it will work.
But to just hear your mic through your PC speakers....you need to set it up as pass through.
Go to the properties of the Recording Inputs.
Did you have any luck in your DAW (Audacity) seeing the mic input levels?