MoMELib is only CLDC 1.1 complied yet.
If you decided to download full distributions with compiled jars, sources and docs (mome-all[version].jar or mome-all[version].tar.gz), please, follow instruction contained there.
If you decided to download only library jar files:
Please, make classes contained in jar files accessible for class loaders and make sure they are in jar file of your project. To do this follow instruction of your IDE.
This library is available (compiled classes, docs and sources) under Common Public License - v 1.0.