Hi Vetmuseum! I think maybe we should start over.
There are several easy ways to record your own voice using the built-in mic on your Mac. Personally, I just open up QuickTime X, choose "new audio recording" from the File menu and away I go.
Garageband is a more powerful option, but may not be needed for what you want to do.
As for recording incoming streaming audio, the easiest thing I've found is Audio Hijack Pro ($32) from Rogue Amoeba. One of the best investments I ever made in software. They also sell a nifty little (basic) editor called Fission for another $32, though I prefer the $40 Amadeus Pro and others round here prefer the ugly-and-buggy-but-free Audacity.
I don't intend to knock Garageband at all -- it's great, particularly for serious voice work -- but it might be overkill from what you've described. I'm all about the lazy -- I mean, EASY -- way to do stuff.