If you grab hold of the black brace (the part that gets bolted onto the fork), push it *in* towards the piston - sometimes it takes a few pushes to get it to loosen up, but that should move the pins in just enough for that larger pad to slip out (with a little bit of jiggling).
Just like Cindy said. Sort of a lean/twist/slide maneuver-off of one pin first, then the other. There's a number of threads around describing it in better detail, but hopefully you get the idea. It will come out of there though.
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