How do you remove cover of windshield wiper and wiper blades

A what? There is a pin that us sticking up from the windshield motor but nothing connecting the motor to the blades, so I'm wondering how do you take the cover or vent off to get to the pin and to put on a connecting arm

i don't know what bat is? it is in your question! you said bat came off motor? copy and paste this link,might be the same as yours! https://www.youtube.com/watch?v=ple1TvNMufQ