Your question is posted under a "CD Shelf System" heading. If you really have one of these, the answer is "you can't". The CD player is a player only, not a recorder.
On the other hand, if what you're asking is how to transfer cassette tapes to CD using a computer, there are a couple of ways. One is to connect a cassette player (boom box, component system cassette deck, etc.) to the line-in jack of your computer's sound card. Download and install Audacity
, which is free software for recording and editing sound. Then you can record the sound from your cassettes as you play them into the computer.
Another option, If you want to be fancy and spend a little money, is to buy a USB cassette deck. It automatically converts the cassette audio to digital and sends it to your computer over a USB cable. Recording software is supplied (sometimes the Audacity program mentioned before). Several companies make them. Here's one
from a company called ION that some friends of mine have, and it seems to work well for them. They've been converting a lot of tapes of family members, and Audacity has been good for cleaning up tape hiss and enhancing the sound.
Either way, once you have the sound in your computer and processed to your liking, you just need to burn it to a CD using whatever burning software you have. (I use CDBurnerXP. It's free, easy to use, and does everything needed for normal CD and DVD burning.)