In Path of Exile 2, instilling happens at the Decanter of Madness, a bench inside The Withered Willow: the Delirium hub on the Atlas, run by Elder Madox. You place an amulet plus three Liquid Emotions in a set order, and the order matters: the same three emotions can produce up to three different notables depending on which one sits first, second, or third.
Liquid Emotions come in tiers, topped by the Potent Liquid emotions: Melancholy, Ferocity, and Contempt. Potent combinations instill exclusive notables that do not exist anywhere on the passive tree, such as Storm's Rebuke, Kaom's Blessing, and Zarokh's Gift (which grants an extra Sinister Jewel Socket). Liquid Emotions also craft a guaranteed mod onto jewels now, keyed to the jewel's base type. To read a recipe in game, hold Alt over a notable on the passive tree, or type CanInstill in the tree search to light up everything your current emotions can make.
Enter the quantity of each Liquid Emotion you have to see every amulet notable you can instill right now, or use the All Outcomes search to look up a notable and find which emotions it needs.