I need to go behind that to install the cabin filter.

Open the glove box door , take a good look inside of it and you should see some round plugs , you will need to pop them out so you can get to the screws , there maybe a screw holding the hinge (if you will ) that you may need to remove as well, you should be able to move the glove box now , if not you may need to close the door and remove the screws just below it. just take your time and you will get it out.