sprite.setImage

sprite.setImage sets Image on a sprite object. It takes id and url.

sprite.setImage(id, url)

function start() {  const id = sprite.create('/sprites/hero.png', 100, 120);  sprite.setImage(id, '/sprites/hero.png');}

sprite.create is there to give the call something to act on; sprite.setImage is the line that matters. The code sits in start(), which the engine calls once, when the entity spawns.