I never have seen this model but guess it's similar to any other CD-Radio model. You can download a manual from here
https://timexaudio.com/media/uploads/product/files/T618_IB59176_84.pdf It should have a switch to select CD player.
Once you select CD player, open CD lid, insert a CD and play
If won't play, CD player is defective and if you don't know how to repair it you should take it to a repair service and evaluate if it's worth to reapir.
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