Kia Optima 2011 Owner's Manual page 332

Maintenance
2. Install the new blade assembly by
inserting the center part into the slot in
the wiper arm until it clicks into place.
3. Make sure the blade assembly is
installed firmly by trying to pull it slight-
ly.
To prevent damage to the wiper arms or
other components, have an authorized
KIA dealer replace the wiper blade.
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