(dont with one coz i is clever ])
next place ribbon behind both bars as shown in picture and bring round to the front
cross the right hand piece of ribbon over the left as shown in pic..
now heres were it gets confusing...the ribbon you have just crossed over and now in your left hand side( or my index finger in picture) take under the bow and in between the wooden posts,bring back towards yourself over the top of the bow.
should look like this
tie 2 ends together in one knot
and there you have it ....A BOW.