This is how you send a file from the iPhone App - Hindenburg Field Recorder to iTunes
From the Field Recorder choose the session and press "Share"
Choose the option "Send to iTunes"
On your computer, open iTunes and select your iPhone to the left.
Now press the Sync Setting to the top right
Navigate to "Files" at the top
Select Hindenburg in the list of Applications
Open to see content
Scroll to the bottom to see your file