Santa Mom Needs Help!!!

I recently re-subscribed to Rhapsody after misplacing my brand new Sansa for almost 4 years.  All of my songs were still on Rhapsody and are showing up on my MP3 player HOWEVER, when I try to play MY songs, the screen reads: “Synchronize to continue your music subscription”.  The thing works on the sample song and I can’t figure out where else to Sync!  I’ve done it twice thru Rhapsody but not  thru windows media center as I do not use that.  This is a re-gift to my son for Christmas.  Can anyone help me??? -Stressed Santa Mom