making seal around door tight so does not ice up

Hi,

You most probably will have to replace the door seal (aka door gasket).

Here’s a link to the door gasket for your model taken from the door parts diagram from this supplier’s website. (door part #8)

It is only shown to give an idea of what it looks like and the cost of the part.

There are other suppliers online that may suit you better.

Just search for WP4-81049-001 to get results.

Not sure with your model whether the gasket is held in by screws or it is a push fit into a groove.

There a videos on YouTube that show how to replace refrigerator door gaskets which may be of some help.