Firstly, click the Flaming Torch once, then add 2 Elven Leaf and 1 Essence Hibiscus to the Cauldron.
Then stir the Cauldron clockwise 3 times by clicking the bottom arrow on the right side of the Cauldron
NOTE: Wait for the ladle to complete a full rotation in the Cauldron before clicking the arrow to stir it again as stirring too quickly will cause your potion to fail.
Then stir the Cauldron Anti-Clockwise One Time by clicking the top arrow.
Then click the Craft button, which is located above the are where the herbs are stored.