Ok I don't have this one but I felt that a video would really help others since several have asked what the shield activators look like. This video is by Silver and it gives a very clear picture of what needs to be done and where to go on the map to do it.
As the other guide on here states...just activate any of the 3 shield activators 3 times in a single match, don't have to hit all the different switches, just have to activate any of them 3 times.
Hope some find this helpful.