I do not use ableton.
But you need to connect your speakers the the UX.
Are a track to record and select the sends from the UX.
You can capture the wet and/or dry guitar. In POD Farm standalone set up what sends 1 thru 4 send.
You do not record with the plug-in, you record either the wet and/or dry sounds with POD Farm (or just pass the dry signal without launching PF).
The plug-in is applied to recorded tracks and you must launch PF from within ableton to access the plug-in.