How do I setup a basic php mailer

I have downloaded the Github files from here;

I’m completely new to server side script, so I am trying to take it one step at a time.
My first step is to get the form to form to display.

I uploaded all of the files to my domain name in the “/contact” directory, however, when I link to it, I get this error message;

This page isn’t working

scooblewoobledo.rf.gd is currently unable to handle this request.

HTTP ERROR 500

As a first step, how do I get the index.php to at least render in the browser?

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