Only the UX2 & above models has the Footswitch Option/s available.

This is from here: PDF Link

Go to Page 2.3 (10 of 53)

And you will see this:

And this utility is found in the "Line 6 Audio/Midi devices"  in "Control Panel"

You will need a Contact Closure switch such as the Boss FS-6 (This is a Dual model, with latchable options and phase selection, but it uses a  9V Battery to power the Lights)

Hello,

  The UX2 has two pedal inputs, which can use two standard toggle or momentary pedal switches into the Footswitches jacks for remote control of GearBox and audio application functions.  There is noway to control the Expression pedal (i.e. wah) from the UX2, put this option is available for the UX8 and the KB37.  You can also use the FBV Mk II controller to control various functions for Gearbox.  See the Gearbox manual (4*13) and the following link for more information.

http://line6.com/footcontrollers/fbvshortboardmkii.html

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Same problem here 

Can someone from Line 6 tell us what should we do to use wah pedal in Pod Farm?

Hello,

  MIDI in POD Farm has not been implemented yet but we're working on it for the next release. I don't have an ETA on when that will be but I can assure you we are going to get it in.

  Has this answered your question?

  Line6Miller

^^ Very good news!!! Thaks Line6!