Thank you!
I didn't realize that snapping the metal bracket down would expand the circular ring inside the cabinet door cutout hole. How ingenious of IKEA!
Now I have another question. It seems that after I've installed the cabinet doors into the cabinets using these Integral 130 hinges, that some of the screws have started to come loose. They seem to have loosened from the small white plastic "screw covers" now that they're screwed into the cabinet. I assume I'll be able to stop by my local IKEA to pick up replacements for these small white plastic "screw covers," but how can I prevent this from happening again? Am I doing something wrong?