Just replaced my cabin filter in my 2007 Edge I've had just over a year. Took about 10 minutes.
Ordered from Amazon for $12.22/activated charcoal aftermarket
ATP Automotive FA-14 Carbon Activated Premium Cabin Air Filter
Looked up the instructions on the Fram website, much easier than the enclosed instructions that came with the filter.
One correction, Step 1 says to release the string hook, but the string wasn't accessible until after
pushing in the sides and I got past the the stops.
Funny, there is no mention of the plastic and metal screen grate that is in the vehicle that goes under the filter.
It looked like a dryer filter full of lint. That may be the reason the 'plactic sleeve' had to be removed by myfordedge08.