Cannot connect to internet

Hello, I installed Oracle Virtualbox 6.1 and used Redhat to create a virtual computer. I am trying to access local files and went about it by specifying shared folders within the Virtualbox but I don't know how to access them through redhat. So instead i emailed a folder to myself so that I can access the files through the internet, but when I open the Firefox I am greeted with the "hmm we are having trouble finding the site".

I am bran new to this so please be explicit with what I am to run etc.

Thanks in advance.