How do I change the air filter in my MB CLK430? on 2003 Mercedes-Benz CLK430

How do I change the air filter??

Asked by for the 2003 Mercedes-Benz CLK430
You remove the housing from the top of the engine and then the air filters(2) are inside the housing.
Thanks. How do I remove the large plastic cover covering the entire top of the engine. There don't seem to be any visible screws or bolts. Does it somehow snap on? I don't want to force it & cause damage.
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