The Radio,Cassette Player/Recorder. and CD ...

if it arrived by mail then the sender might have screwed the transit screws down to avoid damaging the phono , i am not familiar with memorex but if like most turntables there should be some big screw heads visible on the top of the phono or possibly even under the platter all you have to do is unwind the screws until the platter unit moves freely [you should be able to push it up and down a little bit ]