I have a GE refrigerator GFSS6KKYSS Model. Serial #: LS900091 It appears that there is ice on the back of the refrigerator and water is collecting on the floor of the compartment. What is the problem and how can I fix it myself?

This is a rather unique refrigerator in that there is a seperate evaportator (cooling coil) for the refrigerator section and the freezer section, where as almost all other refrigerators only have coils in the freezer section and use a fan to blow some of the cold air into the refrigerator section. This design will prevent cross contamination of odors between fresh foods and freezer sections, and allow lower humidity freezer at the same time as higher humidity fresh foods. All good things.

That said,..... you need to take the cover off the back wall from inside the fresh foods section and thaw out the defrost drain locted at the bottom of those cooling coils. If I remember correctly, there are a couple hidden screws, and the back panel needs to be pryed off using a putty knife, I think you will find 4 small arrows / pointers for the spots to pry at. With cover removed, use a turkey baster with warm water until the water flows out the drain.