Hello!
Thanks for your post and welcome to the IK forums.
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Below are some notes I hope help in the meantime.
1) For iOS use load a WAH style Stomp FX pedal into an empty slot. This should automatically assign this to your Expression Pedal and Virtual Switch on the iRig Stomp I/O. Make sure to not replace a pedal with an existing assignment as this assignment will be kept. Swipe Stomp FX pedals UP to delete them from your chain.
2) For Mac/PC make sure you select the iRig Stomp I/O as your MIDI Input in the Audio/MIDI Set Up (Under the Settings drop down menu). Once done you should be able to load a WAH style Stomp FX pedal into slots 5 - 6 in your Stomp A section for automatic assignment to your iRig Stomp I/O unit's Expression Pedal and Virtual Switch.
Hope this helps!