From EngineHub.org Wiki
- Download CraftBook and WorldEdit (WorldEdit is required).
- In the folder with craftbukkit.jar, make a "plugins" folder if it's missing.
- Copy WorldEdit.jar and the CraftBook.jar files into "plugins".
- Restart the server.
Default configuration files will be created in plugins/CraftBook/ when CraftBook (and the server) is first started.