The Medela SW-SOFT 800.0845 funnel connector is used to connect the Medela breast pump to breast milk storage containers. To use it, first make sure that the breast pump is correctly assembled. Then connect the breast pump funnel to the funnel connector. Make sure it is tight to avoid milk leakage. Next, connect the funnel connector to the breastmilk storage container. Make sure the container is clean and sterilised before use. Once everything is connected, you can start expressing breastmilk using the breast pump. Remember to follow the manufacturer's instructions and consult a healthcare professional if you have any questions or concerns.