Line-In Connection To Creative Sound Blaster Audigy 2 ZS: Help Please

Hi,

Have a new 4700 with the extra sound board, a Creative Sound Blaster Audigy 2ZS.

Boy, they sure don't make it easy for you.
New at this, and can sure use some help, please.

I have a shortwave radio which allows me to output an aircraft frequency directly
to your PC for decoding via a PC program. One uses an output from the radio to the Line-In connector(the blue one) on the PC's rear.

Now is where I have problems.

Where do I go with all the Creative (stuff) to find out if the Line In is actually enabled, and perhaps to adjust some of these settings ?

They have just so many control panels, equalizers, and all sorts of other icons and applets, I am really confused. Of course, there's no printed instruction manual for all of this.

Might someone help me out please ?

Thanks,
Bob