Unplug the dryer and pull the unit away from the wall. If it's warm from recent use, allow the dryer to cool before attempting repairs.
Unhook the plastic or metal clips securing the pipe to the dryer vent and the vent to the outdoors. If the bracket securing the pipe in place is more involved than a simple clip, refer to the instructions for the installed kit to remove the brackets.
Slide the pipe off both vent outlets.
Slide the new pipe onto the outdoors vent and secure it in place with a retaining clip. You may need to stretch the vent pipe slightly to get it to fit over the vent. Repeat this process to connect the vent pipe to the dryer vent.
Slide the dryer back into place, plug the unit back in and turn it on to check for air leaks that indicate a loose connection.