Interact with the horse with an empty hand. Select an empty spot on your hotbar, so you are not holding anything. Right-click the horse to move onto its back.
To tame a horse in Minecraft, start by finding both a saddle and a horse. Next, select an empty spot on your hotbar so you're not holding anything and interact.
Follow these steps to tame and ride a horse in Minecraft: Find a Saddle or Horse Armor. You can find these items inside Chests in dungeons or Nether Fortresses.