Instructions
Create a horde hunter and advance him to the tenth level.
Complete the quest "Taming the beast," which will be given out by the hunter trainer for the horde race you choose. Completing this quest line will award you with the "Tame Beast" spell.
Travel to the Alliance controlled "Bloodmyst Isle" located off the northeastern corner of Kalimdor.
Locate a Blue Flutterer moth, lay a frost trap, then attack the moth once to draw it towards you.
Cast the "Tame Beast" spell on the moth as soon as it is in range. Once the spell finishes channelling, you will have tamed the moth as your pet.