Q:
Armor upgrade(s)
A:
They are already activated.
Think of these as of “slots” in the piece of armor. You put a Rune (check for Runes in the TP too) or Medallion and the Rune/Medallion bonus (such as + Power/Precision) will appear in the armor.
It’s like an enchantment to upgrade armor.
Also, you can replace existing runes for others (though the equipped rune will be destroyed for the new one). The only way to remove a Rune from an equip is to Salvage it, check the % chance of recovering upgrades in the Salvage Kits.
You equip it, and those upgrades can be replaced like any standard upgrade.
But how do I get those upgrades to be activated if I like those better?