If all you're looking to do is animate the morph, Turn on you animation controls if they're not already showing.

1. At frame 1, Activate morph 1.

2. Go to the last frame.

3. Activate morph 2

That's pretty much it. Hit the play button and Poser will run through the frames you have listed to give you a preview of how the morph will look changing from one to another.

You can also uncheck the "skip frames button " at the bottom of the controls to get a more complete look.