Beginner question : Whats to do that a unity app is running on my rented webhost?

hi
Sorry but I´am not a programmer more an end user . So I´am missing some essential Unity Basics
Issue :
A friend of mine devoleped an unity app for me.
I rented a webhost ( CentOS 7.0) installed Wordpress and an e-commerce plugin
The unity app must run on the webhost and pick up some information from the e-commerce plugin

What do I have to do so the unity app can run and be tested on my webhost ?
Do I need to install an unity package or just a runtime evironment ?

regards

You need speak to your friend, who made app, to instruct you about all requirements.