(I think)The first step would be to stitch the last pentagon all the way, but this is very important; keep your thread attached to spool!
The second step, heh. Loosen all the stitches for 2 sides of the pentagon. Make sure you are loosening the thread that is still attached to the spool.
Pull the pentagon away from the hexagons and push the thread apart like this
At this point, cut both pieces of thread to the same length, and thread them through your needle.
You are going to want to push the needle and thread through this hole between the two hexagon stitches, then up through the top.
When you flip the bag inside out, make sure you are flipping it through the hole where the thread is coming out so there aren't any complications
This is when I fill. To close the bag simply pull at each stitch until the gather is the same as all the other pentagons. once you finish, one of your threads will be much longer than the other , just cut them to the same length to make knotting easier.
When I knot off, I do a single/double over/single/double over/ single/ double over/ single/ single/ which equals 8 knots. You should know when the knot is close to the fabric, because it will start to put more gather into the fabric.
Cut one thread to about 1/2 inch. Put the other thread through your needle, push it between the hexagons, and out between the hexagons in another place.
The shorter thread will tuck into the footbag by itself, cut the longer piece of thread that is coming out between the hexes, and you have a nice, new footbag
Enjoy
