Can anyone help me get a better understanding of the Doubletwist setup?

[agdodge4x4]

Need help with Doubletwist setup...makes no sense at all to me

Ive read through the website and 'help' and frankly, its horrid. The downloaded windows software does nothing that the help pages indicate. I have the software installed. I have itunes with music in it. How do I get it all transferred to my Android Note 4? Also, what in the heck is the purpose for all this mess when you can drag and drop MP3 straight to your android?