Hi Rita,
Saw your message. It looks like you’re almost there. All you need to do now is to go to Halion and set the MIDI channel for each articulation in sequential order, as you had it the first time (1, 2 and 3), then match those MIDI channels to the articulations found in the Expression map setup window shown on image 2. If you look towards the right, under the “Output Mapping” pane, you will see the “Channel” setting. I would remove that “Note On” mapping, btw.
Give it shot. It should work now.