Where is the filter and how do you replace it

The diagram shows the filter to be located in fresh food compartment near the controls. You will need to turn main water supply off and then turn counter clockwise. Replace with new one and purge the air out meaning it will take a little time to get the air out until you get clean water again. Below is a small diagram, you can get more information free from the people that sell te filters and parts. I need to assume your model number, but if you know the correct model number enter it in the model search feature,

http://servicepartstec.blogspot.com/ model GS2987EKDA

Part number UKF7003AXX
Water filter is on left lower side of picture #26 , Thanks, Sea Breeze

Remove the kickplate in front at the bottom and see if there is a screwout filter between the to doors