Thank you for everybody responded to my question, especially big thank to MKX2007.
I followed your steps and I got access to my cabin air filter and replaced it myself.
However, I needed an extra step on my 2007 EDGE, which was to release a string hook.
So my complete procedure looks like this......
"To remove the glovebox door, open glovebox door, release a string hook on upper right corner then you need to squeeze the upper rear corners inward & the door will come forward & lift completely off. ....."
The string attached to the glovebox, so when you open the box, the box dropped with a hydraulic feels. Maybe you don't have this in your MKX.
To give people some idea, I took pictures.
The first picture is the Cabin Air Filter. I paid $11.88 on Amazon.
The 2nd picture is the area after glovebox been completely removed.
The 3rd picture is same as 2nd but with filter access door opened showing location of filter.