EZ Vinyl/tape recorder not recording properly on my mac

I just set up my new Ion usb turntable and recorded two tracks from an LP. Everything seemed to be working fine until I listened back to the tracks on i-tunes; the source of the recording was my built in mac mic, not the signal from the turntable. I could hear myself talking on both tracks! The meter levels were working though so I’m not sure what’s going on or how to fix it. Help!