itunes connect problem

I'm a beginner. Have constructed app and am trying to get it externally tested. I can't upload my app to itunes connect. It says use Application Loader which i've tried from Xcode but nothing happens. If I just click Application Loader from itunes connect then nothing happens, just a blank screen.What extra do I need to do?

Which version Xcode are you using?

itunes connect problem
 
 
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