from development to production - uploading a webpage

First of all, I will excuse myself for possibly making vague questions.

I am a newby freelancer webdeveloper, and I recently created a webapplication which works fine on my own computer, running it on localhost.

More recently, using A2Hosting, i bought a domain and some server space, and my objective is to upload my application in order to make it online for anyone.

However, right now, I am having a few problems. Specifically, I do not know how to upload my web application. Basically, what I did was upload all the folders and files I had on my local machine into the server, and I was hoping that would work.

Unfortunatly, the server continues to display the "initial" site I uploaded. a simple, static, htlm file saying hello world. This file is the index.html that is inside the "www" folder.

The directory of the server is presented in the following figure.

My question is how do I make the server display the content of react/redux page, instead of the simple static html initialy uploaded.