It's easy! Very easy!
Step 1: Make an 8
On your loom, take a band and twist it like the figure 8 and place it on two sticks
Step 2: Putting It Up
Then put two more bands on the top without twisting. Bring the last one on the top with your loom stick.
Step 3: Keep Reapting
Keep reapting the steps without the bands twisting into a 8. Stop when it's the right size.
Step 4: Closing the Band
Take off the loom band from the loom. Take an 's' clip and put two bands of one side on one side of the 's' clip. Do same thing with other band. And your fishtail loom band is ready!