Sony MD Help... PLEASE!

[BreakerC]

Hello... Im new to the site~ I lost my directions booklet somewhere, i was wondering how could i upload songs in my MD player.. I got a Sony MD walkman MZ-NH600D..... Everytime i plug in my adaptor no icon shows up... And it says "Cannot Record or play".. Can anybody help me> Thank you peeps///
:D
I just got the thing, so please help me :(

[BreakerC]

i forgot to tell you guys that my Comp is a MAC4 :o