Hi,
You can configure My Inbox by installing UIX01CA1 200 and IW_PGW 100 (you should already have this component as this is required for Approve Requests) in your front end server. The remaining configuration steps like scenario definition, defining decision options, configuring scenario specific tiles on launchpad etc. are the same as you would have done for Approve Requests.
Regards,
Saurabh