How do I fix this?
 

I just noticed today something was hanging off near the front passenger side.
Looks like a cover. How do I fix this.
https://cimg4.ibsrv.net/gimg/maxima....412d948829.jpg

Plastic zip ties would probably be the easiest way. The same thing happened on my Mother in law's old Altima & I zip tied it back up & it held for years until she finally sold the car. You could also just rip it off completely, it's really up to you.

^^+1 zip ties ftw