This tutorial shows how to load your volume into the Segment Editor Module and create multiple segmentations. You will learn how to generate segmentations using the paint and grow from seeds functions. You can apply those functions and create a 3D Model that can be exported and saved out of the Segmentations Module.
Watch at 1.5 speed if you are not following along in 3D Slicer.
Go to Settings - Playback speed - 1.5