How to create custom mouse cursor for Three.js - threejs-editor

How can i create custom cursor? In this example no cursor(aim) in center of camera
https://threejs.org/examples/#games_fps

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I need to figure out how in the world do I create object instances (an image) and place them on the screen and have it draggable. I know how to draw an image (png) onto the screen, but how do I make it draggable?
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