Unfortunately, the User Guide has not been written yet. For the time being, have a look at the examples, the javadocs and the source code. Just download the current snapshot and play around a little. It's a rather small API - you will find your way.
To execute code based on motej, be sure to include the motej library, apache commons logging and a JSR 82 Implementation (e.g. bluecove) in your classpath.