You access MEP configuration mode from the MA configuration mode using the mep command. When accessing the MEP configuration mode, specify a MEP ID in the range 1 - 8191.
This example enters configuration mode for the myMA1 MEP 1000:
System(rw-config)->cfm md string-name myMD1 System(su-config-cfm-md.1)->ma string-name myMA1 System(su-config-cfm-ma.1)->mep 1000 System(su-config-cfm-mep.1000)->enable System(su-config-cfm-mep.1000)->