Once you have a Tier 8 Couser at level 30, you can start “training” the horse. This involves feeding different materials into the horse, until you have enough to do an “awakening attempt”.
To start, put the horse in the stable at Stonetail Horse Ranch or Grana (Melabee NPC – West Stable). Make sure it doesn’t have any gear equipped or items in the inventory. The option “Courser Training” will be available at the bottom.