Once the LDM system is installed and configured, activating it takes only a few steps. See LDM Reference: Activating the LDM Installation for instructions.
You should view the LDM logfile, $LDMHOME/logs/ldmd.log, to see what a successful activation looks like. Information on interpreting the LDM logfile can be found at LDM Reference: LDM Logfile Format and Interpretation.