To enter a Runecrafting altar you must have either a talisman that matches the current altar you are trying to enter (or Omni-Talisman for level 50 and above), then click Use and then on the altar.

How do you get runecrafting?

Obtaining. Rune essence can be acquired by mining and from monster drops. Rune Mysteries quest. After completing this quest, a selection of wizards can teleport the player to the rune essence mine, where the player can mine the Rune Essence to obtain rune essence for the Runecraft skill.

How many hours does it take to get 99 runecrafting?

91-99 is around 320 hours. You'll still make around 350m from the natures.