Write your intention on the outside, concentrating on what you're seeking.
These work well when consumed by fire. Either burn the envelope whole in a bonfire or fireplace or burn just the herbs on charcoal the way you'd use any other herbal or resin incense.
This particular charm also works great tucked under your pillow or mattress or kept in your underwear/lingerie drawer. You can also add the herbs to a bath for soaking or to a smaller amount of water to use as a wash.
This photo was taken before Johnny had a chance to decorate the outside edges of each envelope (we're gonna update this, I swear)