Apple released Genmoji in iOS 18.2, released to the public on Wednesday, December 11th, 2024. To use Genmoji, a button should appear on your Emoji keyboard once the model is ready on your device.

If you don’t see the Genmoji text field or button, and you meet the requirements for Apple Intelligence (Device, OS, etc.), check Settings > General > Keyboard > Stickers is turned ON

if this is off, toggle it on, and the Genmoji options should now appear on the Emoji keyboard.