There should be a little cut-out panel at the bottom left of the machine. Once you remove that panel, you'll see a drain hose and the filter access. Extend the drain hose, remove the drain plug on the hose and drain the water from the line (into a small bucket). Once the line is empty, unscrew the filter by twisting the handle counter-clockwise. Clean any build-up from the filter, wipe out the inside of the filter unit and then replace the filter by screwing it back in. There is no filter to replace. You just need to clean it regularly.