The rear wiper blade and wiper arm have a cover for protection.
To remove the cover:

To replace the wiper blade:

Front Wiper Blade Replacement
Gas Strut(s)#13-00-90-001: Information for Engine Oils Used in 2014 Model Year Vehicles - (Jun 27, 2013)
Subject:Information for Engine Oils Used in 2014 Model Year VehiclesModels: 2014 GM Passenger Cars and Trucks dexos1™ and dexos2™ Information WebsiteRefer to the following General Motors website for dexos1™ and dexos2™ informationabout the different licensed brands that are currently av ...