Choose a location for your herbal steam (some good options include sitting at the kitchen table or standing at a counter or the stove.)
Boil water.
Add herbs or essential oils to the water.
If desired, move the pot off the stove to a location with a hot pad or other heat-resistant surface.
Position your head over the bowl (take care to keep the proper distance to avoid burning yourself with the steam).
Drape the towel over your head to form a tent and place your face in a way that the steam is focused where you feel it's giving you the most benefit.
Close your eyes to prevent them from getting irritated. This is especially important if you're using essential oils.Inhale deeply, even if doing a facial/skincare steam.
Adjust your head and towel if needed.
Continue the steam for 5-10 minutes.
Expectorate and blow your nose as needed during the process.
Cover the pot with a lid.
Let the herbal steam cool and pour it into another container to store in the fridge until your next use. You can reuse the herbs a number of times until you feel that you want a new, more potent batch.
To reuse, simply reheat the water and herbs to boiling and steam again. If desired, you can add a bit more herbs for later uses.
Repeat every several hours or as desired throughout the day.
Notes
Note: There's no magic amount of herbs to use. You can use less than the recommended amount or more. It's completely up to you. I typically don't even measure the herbs and just toss a small handful into the pot.