What you need:
Black candle
small piece of Parchment paper
Your own blood (only 2-3 small drops)
The victim's name
Matches or a lighter

Write the victim's name on the paper (preferably in ink) and smear the few drops of blood on the paper over the victim's name. Then light the candle, and hold the paper over the flame until it catches. Chant until the paper has turned to nothing but ash:

"By my blood and my desire, (his/her/their) death I require."

After the final time chanting, say "This is my will so mote it be!" as you blow out the candle.