In scene mode, you can use morphs with either the graph editor, or the timeline, or both. For the timeline, you need to press the '+' at the very bottom of the scene next to your scenes name. Now drag up the bar on the left, and press the '+' on world. You should then have a list of all the objects, figures, targets, lights, etc. You can press any of the '+' symbols next to them to bring down a list that should include the morphs. You can then click the morph in the list, and double click a key on the timeline. Then press 'add key' and enter a value for the morph target. 1 is full, 2 does twice the morph target and 0 goes back to no morph target.