Trigger for Summon Holy Relic of Conviction

I am a bit confused (new to POE, go figure) on how to get my Summon Holy Relic of Conviction to trigger off Lancing steel of spraying instead of Shield Charge.
Here is a link to my POB: https://pobb.in/xFvb0goHbSy6
This is my first post so I apologize if more info is needed up front.
Thanks!