How do I get the turn signal cancelar plastic piece out of steering column

Murray said

That link to the '72 FSM explains how to remove the cylinder w/o disassembly of column. Look for a small notch beside it and release with a small screwdriver. Love those FSM.

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Do you have to go into the coloumn somewhat to do this? I am just not seeing how to do this? Maybe if I can get the turn signal switch out of the way. That is the problem. I cant get the turn signal switch out. That square piece of metal that I circled in blue in my pic is holding me up.