Minecraft wiki entry for Create_a_Mac_OS_X_startup_daemon, associated text: This created your user. Obviously you need to modify the UniqueID (UID) for the one you chose in this step, and the PrimaryGroupID for the one you chose in the previous section. You can also choose a different home directory. You can put your Minecraft folder with the other users, but it's fine to put this anywhere you want, really.