To make an over ice drink you need to use double the coffee grounds than you normally use.
Fill the unit with 7 cups of water  and fill the carafe with ice cubes to  the marking on the carafe.
Turn ON the unit and turn the dial to "Brew" than press the "Over Ice" button and select "Fast".
The amount of water, coffee grounds, and ice cube could be adjusted based on your taste.
Keep in mind the ice cube will melt so do not overfill the unit with too much water.
Never add ice cubes inside the water tank of the machine.