You can burn it on charcoal and send the "spirit" of the herbs to them by getting a raven feather and swaying it in the direction of their house or a picture of them, make a packet with the name of the enemy 11 times and a picture or any personal articles, sway it over the incense and barry it in the graveyard or somewhere they'll step over it.
Incense is usually used in ritual, but can also be used by itself in many ways. Use your imagination, anything directed towards the person you are attempting to seek triumph over will find its way to them.
Lots of information here, did you check this already?
http://www.luckymojo.com/incense.html
Look under "how to use incense in magical spell work"