Go to CUSTOMIZE buttons under the activity that you're accessing this NET input and as you can see there are two sets of directional commands. Assign mapped the NET/USBdirectionUP,DOWN,LEFT and RIGHT to the lcd or regular button. Because those are the commands that will navigate your avr if its under the NET/USB mode.
Hope It Works!
I don't need kudo's BUT accept the solution if it helps you solve your issue. So others with the same problem can see it too. 
