Step 2: Soak fabric in soda ash
1/3 ish cup soda ash powder
1 gallon water
in a zip lock bag.
You probably want to use enough water to cover the fabric.
Pour in the water, add the soda ash, close the bag and shake around, then add the fabric.
Let it sit half an hour.
This step matters. The soda ash prepares the fabric fibers to absorb dye. If you don't do this step the dye will fade dramatically in the wash.