1973 Dart wiper arm removal

Need a little help from you guys so I don't damage these. I've looked in all my manuals and they say use a small screwdriver or something and pull the locking tab out. These pictures aren't great, but is the part I circled what needs to be pulled? Is there an easy way to do this?
Searched the forum and still scratching my head. It looks to me me like the part circled is really recessed so i think it may be hard to get a hold of them.

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