We are very sorry to read this. We will check the product and correct it if necessary. You are welcome to contact the Galaxus assistant in this regard. https://www.galaxus.ch/help
Hello, you need to connect it behind the machine to the top connector (the plug with the water drop logo). This will drain the water when the machine is running. PS: don't forget to remove the second black rubber plug inside (behind the white plug) before plugging in the tube, otherwise it won't drain.
According to the entry, it must be ordered in addition: Electrolux EWKIT5 - Premium Window Kit
Reviews are not very positive there - check if your window setup meets the requirements (see photo in product description).