So how do I use the pedal.

I have paired the pedal with my iPad 1 which is running the onSong app.
onSong
I use the left two buttons to switch between songs in onSong.
The two right buttons have been set up to send midi control codes.

Click on the pedals in the menubar of onSong.
OnSong1

Click on the pedal you want to add midi too, and choose midi:
OnSong2

Choose control and the right control code
OnSong3

The onSong app has the midi add-on enabled.
NetMidi JamUP

I have NetMidi and JamUP installed on my iPod Touch 4th Generation.
I use a WiFi Router attached to both the iPad and iPod Touch to network them.
WiFi
When onSong is active on the iPad I can select the iPad in NetMidi.
JamUP is set up to listen to midi, and switch presets up or down, based on the two codes that are attached to the right two pedals. JamUP1
JamUP2
JamUP3
JamUP4