Sunflower help

Apparently a bird pooped in our yard, and we ended up with a rather large sunflower.  The kids loved it, but the flower got too big for the plant and actually tore off.  A lot of the seeds look like they're mature, so how do I save them to plant for next year?  Anything special I need to do?  Let them dry on the flower, or pick them off now?  Dry them out, or store them in the fridge before they've dried?

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