You need to cut a hole in both sides of the cooler for the dryer hose, so:
set your compass to 6.5 cm and draw two circles, on opposite sides of the cooler (longways)
Step 3: Cut
Cut out the circles you just drew, the cooler should now look like this
Step 4: Feed
Feed the dryer hose through the two holes. leave one end longer that the other. one side should have about 4 in coming out, the other about 10. try bending the hose inside the cooler to get the most contact with ice.
Step 5: Ice
Fill the cooler with ice
Step 6: Attach
Attach The cooler to your fog machine by pushing the longer end of hose around the nozzle of the fog machine. just keep the two together and all of the fog will go into the hose.
Step 7: Fog!
turn on the fog machine and enjoy your fog not floating away!