Soak the brick of wet floral foam in water until saturated, about 1 minute. The easiest way to do this is to fill your sink and let the floral foam float until it sinks.
Prepare your container by filling it with foam. With a knife cut the foam to the size of the container. The foam should sit snug in the container so it won't shift.
Be sure the foam is not only snug fitting but also allows "wells" for water. This will reduce the amount of watering the arrangement will need.
Take the moss and break it into pieces and place on top of the foam leaving the very center of the foam open for now. If needed add more moss to cover anything you do not want showing.
In 3 different places, using tape, tape two sticks together creating a stick bundle.
Push the stick bundle straight down the center of the foam. These sticks will be supporting the lily stems.
Take one stem of lilies, give it a fresh angled cut at the bottom of the stem and place it in the foam right in front of the sticks. Repeat for all 4 stems placing them at 12:00, 3:00, 6:00 and 9:00. The flowers should all cluster at the top of the design measuring 20"-24" from the bottom of the container.
Cut a 24" strip of ribbon and tie the strip around the stems of the lilies right under the blooms. This will secure them to the stick bundle.
Take the same kind of ribbon and make a bow. Start by leaving a 8"-10" tail.
Loop the ribbon up and fold over towards the back and pinch. You want the loop to be about 6".
Then slide the ribbon down and loop towards you making the same size loop and pinch on top of the first pinch.
Repeat the loop process making 5 loops, 3 on top, 2 on bottom. After the 5th loop leave another 8"-10 tail.
Take the pinch part of the loop and secure it to the arrangement by pressing it in the center of the ribbon knot used to secure the lilies to the stick stack. Tie and knot.
Cut tails at an angle to finish.
Take some wire cutters and cut the tops of the sticks down.
Water the foam in the container every 2-3 days or as needed. Enjoy!