Bag "N" Box 

Begin with a new box of syrup.

Remove the perforated section of cardboard from the box and pull the nozzle out.

Remove the plastic top from the nozzle and discard it into the trash.

Make sure to carefully attach the line to the nozzle by turning the green section to the right.

Once properly attached and seated, the line should pressurize and the syrup should be ready to use. 

You may need to dispense some soda at the drink station to clear any air bubbles from the line.