Military Flight Bag is only available to pilots who have authorized access to D-FLIP data. Pre-qualified email domains include: @cga.edu, @forces.gc.ca, .gov, .mil, @mod.uk, @usna.edu, @usma.edu, @usmma.edu
After you enter your email address in the verification box on www.foreflight.com/products/military-flight-bag/ the verification box will change to allow for the verification code to be entered in that same box.
If you are entering the verification code on a different browser (or at a later time) click the Already have a verification code? link on the Military Flight Bag page then enter both your verification email address and the verification code you received: