How do you craft runes on runescape

start by completing rune mysteries, then go to the air altar with an air talisman or an air tiara with rune essence to craft air runes After rune mysteries, you can about craft any rune by gaining up your rune crafting level. But you craft specific runes, you need rune essence and you need that rune tiara/talisman and go to that rune altar and enter to craft your runes from the essence.