step 1: tame the horse. (I would recommend feeding it a hay bale first)
step 2: press 'E" while on the horse
step 3: put the armor in the armor slot
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press on the horse with a right click then you can put on armor and saddle on a horse
If you go into sneak mode (hold left shift) and right click on the horse, you will open its inventory so you can equip it with horse armour and a saddle.
You can't.
You can't. Enchantments are only for tools and armor for now.
Right-click it.