HOW TO SYNC BETWEEN APPS???

ok, I bought the two apps, the iPod Touch/iPhone app and the Desktop App, HOW IN THE HELL I SYNC THE TWO OF THEM? it seems impossible! or maybe is so damn easy that I can't get it! somebody please help me here so I can just take my funds with me anytime. I'll really apreciate your help!
 
sad I’m MAD
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