I can’t hear the sound while transferring from cassettes to

I have the current version of Audacity-win-2.0.3. It doesn’t say anywhere in Help, if it is zip or exe.
I have Windows 7 Home Premium 64 bit 8GB DDR3 SDRAM, 1600MHz-2X4GB

I am trying to do simple thing but I am not so much technically savvy.
My question for now is why I can’t hear the music while transferring from a simple tape recorder (cassettes) to the computer? I use cable 3.5 mm two male jacks. I put one on the back of the computer and one in the cassette player. If I keep the headset plugged in, it doesn’t work the recording. When I take off the headset, it records but I don’t hear anything. The sound is only in the cable between the devices. I can’t hear the songs. The headset interferes somehow with the cable. I don’t have speakers on the computer, only headset. What can I do to hear what I am transferring?
It could be not important question, if I learn how to delete a song, after I read the manual. I printed the manual and I hope to find there how to delete the unwanted songs and burn the rest to disks, since I don’t hear what I transfer.
Thank you in advance

It sounds as if you are recording from the wrong input.

Connect to the blue line-in of the computer then choose line-in as the input device in Audacity Device Toolbar .

Then turn on Transport > Software Playthrough (on/off) in Audacity. Make sure that item has a tick (check) then you can hear while you are recording.

See http://manual.audacityteam.org/o/man/tutorial_copying_tapes_lps_or_minidiscs_to_cd.html .

If you have a line-in but it is not listed in Device Toolbar, click here http://wiki.audacityteam.org/index.php?title=Mixer_Toolbar_Issues#vistacp .

If you do not have a line-in then to get good quality recorded songs you should buy a USB interface that has a line-in like Behringer UCA 202. Then you connect the cassette deck to the red and white inputs of UCA 202 and the UCA 202 to am empty USB port on the computer. You may need a 1/4 inch to RCA stereo cable to go between the cassette deck and UCA 202.