On a kenmore model 596.693601 bottom mount refrigerator year 2015. how do i remove the panel (which is insulated with styrofoam) at the top back of the refrigerator?

SOURCE: kenmore elite refrigerator, model # 59676534500

I went ahead and signed up for Sears' service warranty since I knew I had to get someone to come out.  IT costs $200/yr.  They say it covers everything, but when the technician came out, he told me that it just covers $500 per visit.  He said that a new motherboard and the labor alone was going to make it $498.  Anyway,   he had ordered a new motherboard. Apparently the motherboard wasn't working.  It is located in the back bottom left side of the refrigerator behind the panel.  There is a compartment on the lefthand side that slides out and houses the motherboard.  He put that in and also had to fix the fan that is in the back of the freezer.  That fan is the one that sends cool air up to the refrigerator part. When I had looked at the fan before the repair man came, it was not moving at all.  So at least take a look at the fan in the freezer.  Just take out the freezer drawers, and the fan is located in the top center of the freezer behind the compartment cover.  Maybe that's the problem with your refrigerator, the fan.  Hope that's all it is. Good luck!

SOURCE: Ice build-up in freezer - Kenmore Model C978-66795-2

don't know this appliance but for guidence:
some appliances have the evaporator in a compartment at the top of the freezer and the drain comes out of the back and runs externally to the drip tray. there should be a grill in the compartment so just peer into it and see if there is ice build up.
wherabouts is the freezer ice forming?

SOURCE: Top freezer Freezes/ Bottom not cold

defrost problem. advance defrost timer to defrost (till it shuts off) . remove freezer panel, check voltage and amps to heater,if heater is hot, replace timer, if heater is cold and no voltage, replace defrost limit switch. defrost all ice, carefully! with hair dryer, no poking with screwdriver.

SOURCE: Rust spots appearing on front of doors of kitchen (indoor) Kenmore refrigerator.

paint ain't perfect!
rust on a 15yr old appliance is normal

SOURCE: Removing Back Panel of Kenmore Washer Model 11020902990

if its less than 15 years old its a direct drive whirlpool, no belt, remove the cabinet, not the back panel. look up direct drive whirlpool washer cabinet removal on internet, and replace the coupler, most likely, if it drains.