cut and prepare your bias strips.
Insert one end of the strips into the wide end of the tool
Now the next part I can't figure out how to do smoothly. I use either a seam ripper or my turning tool to grab and work the fabric through to the narrow end of the tool
Once you finally get that through, the rest is SUPER easy.
Just start to pull. The tool folds the strip for you
Continue until you've pulled and pressed the length of the entire strip
Then attach as you would purchased single fold bias tape
Lay main fabric inside
Fold over and pin, then sew