Summarize the following:
Nettles, eyebright, and butterbur can be used in steam treatments if you have the dried herb. You will only need 1 teaspoon (about 1 g) of the dried herb per treatment session. Stir the herb into the water so that it is fully combined. You do not need the water to be actively boiling, just steaming. Cover your head with a towel and inhale the steam using both your nose and mouth. Do this for as long as you want to, but the longer you do it for, the more your sinuses should be cleared out.

Summary:
Get herbs to use in a steam treatment. Add the herb to 1 cup (240 mL) of boiled and steaming water. Breathe in the steam.