To sync, connect your Kindle to your PC using the USB cable. highlight the device and click on sync. Once you're done syncing and unplug your USB cable, you can listen to your playlist on your Kindle by scrolling to Menu and selecting Experimental and choosing Play Music.

To stop playing music select the Stop Music option or the Alt+P keyboard shortcut. You can skip to the next track using Alt+F.

to complete syncing media to your device on a Windows pc:
1. plug the USB cable into your computer
2. the device will show up under devices on the left navigation bar
3. highlight the device in the left nav.
4. in the sync window click the tab for music (audio).

click on the checkbox for sync with this device
all media (depends on which tab you chose)
only the selected
in the box below these choices you'll see individual directories of content. If you selected "only the selected" you can then choose to sync any/all of th displyaed directores.

5. when all is in place, click Sync on the bottom right and sit back and let doubleTwist do all the heavy lifting.

For Mac:
Its a simple as drag and drop, from your media library or from items in your activity feed. Easy as pie!