With a few simple steps you will be able to reveal your before and after images.
1. Simply drag an instance of the block in to your page.
2. choose 2 images with equal size.
3. choose witch direction to reveal the before and after effect (horizontal or vertical).
4. write the amount in percentage of where the before and after reveal will be set to start
5. write your alt text and title for the image tag
6. hit save.
7. publish your page.
And here you are - you are now making it possible for your users to see the before and after effect.