How do I replace the Cabin Filter?

Hi, I have a 5th gen prelude. I got 2 new filters from hondas. I took the glove box out then what do i do? I see a large plastic black box just behind the glove box but I dont see any ways getting in. please advice! thx.

theres a metal bar attached to the glove box that came out...theres a plastic piece behind it... you have to break that off (i know but thats what it says in the manual) then you can get access to the ac box and its easy from there