Blood's Honor

After Completing The Silver Hand Quests, Kodlak Whitemane will ask you to reterive the head of a witch to get rid of the Werewolve curse.

Speak to Kodlak Whitemane

Seems fairly obvious but to begin this task talk to Kodlak.

Collect a Glenmoril Witche's Head

After talking to Kodlak, you will be given a map marker for the location of the witches. The witches reside in a cave near Bilegulch Mine in the southwest corner of skyrim. Upon entering the cave cave there will be several witches sporadically placed in the mine. The first one will be very close to the enterance.

(Optional) Wipe out the Glenomril Witches

While the quest only requires you to kill one of the Witches, it may benefit you to kill more.*Spoiler* Later on in the quest you will need one to cure Kodlak of the curse and one to cure yourself if you so choose *Spoiler*.

Reutrn to Kodlak

To finish the quest return to The Copmpainions home in Whiterun and speak with Kodlak.