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If you could take a picture of how you have it all installed at this point I can better explain how the hoses are connected. There is a paper clip above the text box you can use to attach the pictures.
That being said, the drain hose below the reservoir just goes straight down into the drain hole at the bottom of the ice bin. There is another hose coming from the circulation pump inside the reservoir which goes up to the water feed above the chill plate at the back so that when the circulation pump is running it pushes water up to that feed pipe and water runs across the chill plate.