Approve purchase order - SAP Fiori App

Hello experts, a pleasance to speech to you.
Today I person the pursuing query:
I request to instrumentality Fiori : Approve acquisition bid exertion (App ID: F0402A) connected my SAP S/4 HANA Cloud Private system. (https://fioriappslibrary.hana.ondemand.com/sap/fix/externalViewer/#/detail/Apps('F0402A')/S32)
I've searched a batch but I'm conscionable meager with the accusation I got, truthful I would similar to cognize if idiosyncratic could assistance maine to find my mode to instrumentality this application.
My doubts are:
1) What is My inbox? and however does it subordinate to Approve acquisition order.
2) Is determination immoderate demo video to spot however the exertion works?
3) I lone person to instal the Front-End Components and the Back-end Components, and the exertion volition commencement working?
4) Can I lone instrumentality the Approve acquisition bid exertion oregon should I instrumentality immoderate different exertion unneurotic with this 1 for its close operation?

Of people I convey anyone who tin assistance me, due to the fact that it is simply a large occupation I request to solve. Thank you precise overmuch successful beforehand to everyone!

Regards, Max.