Pull the drawer all the way out. About 3/4 of the way back of the rails on each side is a plastic locking tab. Push the tabs in and pull the drawer the rest of the way out.
VERY interesting. You might want to see my thread today under maytag, MBR2258XES and all the feedback. Warranty repairman finally showed up after a week, and that drain grommet was super sticky...gummed up, etc. He said the rubber deteriorates because of the heat, which I am inclined to believe because there is nothing there but water to gum it up. He said the current fix is to just remove it ( they send the part to whirlpool for analysis). There are dozens of models of Whirlpool, Amana, JennAir, I think Kitchen Aid, and Maytag all made in the same factory, presumably, hence the similar problems.
I contacted maytag "chat" about getting a part number to replace the duckbill. Turns out they don't actually know anything, they just chat, about the weather, or whatever, but not about anything tech!!!!!!
I go to rear and remove duckbill-insert zoom spout oiler with hot water up tube-it will melt the ice-or use a steamer it works great-install P-TRAP part # W10619951 then remove freezer door 4 screws then lower basket and use steamer to remove rest of ice in drain-no need to remove back panel or side rails.
this is the repair for the sticky duck bill. go here