The configurations depend on the the role and application from where you wish to initiate the process.
If it is from HR Renewal based MSS role , home -> team page application you would have to configure the LPD_CUST entry as documented here Assignment of a Process to PFCG Roles - HR Administrative Services (PA-AS) - SAP Library
If you want to have a direct link in the portal even that is possible. Refer to this discussion https://scn.sap.com/thread/3472875
Hope this helps.
With regards,
Sahir.
