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I just changed mine and while there are different attachment methods, mine had a small tab, located under the attachment. Push the tab down, towards the windshield, with a small, flat-blade screwdriver. Work the wiper off the hook.
I've attached a photo showing the tab. (I'm tech challenged, hopefully, the photo is attached).
Jim, I'll see if I can attach a second picture. The red object is the small flat blade screwdriver. I place it so I can push down on the locking tab. The yellow line shows the direction that you push.