Firstly install the component IW_BEP (if not already present) on your back end system. Then install the components UIX01EAP 100 and GBAPP002 600 on the front end and back end servers respectively. Then follow the steps given here App Implementation: Approve Purchase Orders - SAP Fiori principal apps 1.0 for SAP ERP - SAP Library to use the Approve Purchase Orders app. Similarly you can install the required components for other Fiori apps and configure them.
Regards,
Saurabh