You need to replicate the tables from SAP HCM system to SAP HANA database. Refer HANA Live Admin guide to understand prerequisites for HANA Live. Refer the installation Steps Sec 1.4.
Once all the relevant tables ( refer SAP Note 1849168) from SAP HCM system have been replicated in HANA then you just have to configure schema mapping. You can do this in Quick launch and define Schema mapping. The authoring schema should be SAP_HCM and physical schema as SAPHCM, assuming this is where the tables reside.
If the physical schema in HANA is SAP_HCM, then no schema mapping is needed.
~Tarun