Things go back together in the reverse order.
In our Jenn Air JCD2B89GES side by side the freezer drain was clogged/frozen shut. It is in an aluminum tray that you access by taking out the shelves and then taking off the back panel inside the freezer (two 1/4' hex head screws.) You lift up the top plastic panel (with the "bulge" in it )and that lets you remove the lower plastic panel (the one with the louver vents at the bottom.) After melting the ice with small applications of hot water, the drain hole was visible. Again, apply some hot water, remove it, add some more, etc. and the drain opened and the water gurgled down to where it is designed to go (which I assume is the evaporator tray.)
I took the precaution of adding the suggested copper wire "prevention" mod described here.

One additional suggestion. If you have the ice maker I would suggest emptying out all the ice after you're done. In the short time it takes to unclog the drain, some of the ice will partially melt. I assume that when it refreezes, you'll have a big block of stuck together ice cubes to deal with. Of course, I did the "repair" with the unit unplugged.