Hello, and thank you for using this service. I'll be helping you with your problem today.
OK so it sounds like you know what problem you have which is a clogged drain line so let me go over a few things. Unfortunately this is not an easy issue to fix on these bottom freezer
top refrigerators. You will want to unplug the unit for 24 hours to allow all the ice to thaw out. Once the ice is thawed out, the best way to clean the drain line is from the bottom up because going at it from the inside is really difficult. If you pull the refrigerator forward and remove the bottom access panel and locate the rubber hose which comes down directly from the middle or so of the freezer floor toward the back and use something like a turkey baster to shoot hot water up the hose. Once it's clear and you can blow air through the hose, you're good to go again. Also, if you have the ability to just unplug the refrigerator for 24 hours that'll thaw all the ice out and them you can just blow air up and clear the drain out.
The other option is to remove the drawer out of the freezer, then remove all the racks and rails on the side walls. Remove the plastic vent directly in the middle of the back panel toward the top. Remove all the screws going into the back panel because the ultimate goal is to remove the back panel. Once the back panel is removed, you can use a hair dryer to thaw the drain line out. Pour hot water down the drain hole until it's draining properly again. Once it's draining properly blow compressed air down to make sure it's clear. If you don't have compressed air, use a turkey baster to make sure the drain line is clear and draining properly. Cut a solid copper piece of wire about 6 inches long. Wrap it around the defrost heater a couple times just above the drain hole and extend it 2 inches into the defrost drain hole. That will transfer heat into the drain hole when the defrost heater turns on and will prevent the defrost drain line from freezing over in the future.
Also, if you didn't want to use a copper wire, there is an actual kit made which you can wrap around the heater if you wanted to buy the actual kit to perform this task.CLICK HERE
Now you did ask how to remove the upper drawer inside the freezer and that is a bit difficult but I'll try to explain. You must pull the drawer out. Then slide a flat head screwdriver from the top of the left glide way back inside the freezer about 2 inches from the end. Pry out because there is a plastic clip on the back of this glide and to release it you must bow the entire rail glide. Once you have both glide rails unclipped the entire track system and drawer pull out of the freezer.
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