Stating no internet , installing Steam on Pop Os

Hi Guys, any chance some one might help me out . I am ditching Windows 10 and moving to Linux. I downloaded and installed Pop OS Linux Distro today. It was going on a clean Hard drive. No problem with the system install. The problem came when I tried to open and log into Steam. I went into the PoP Shop and when I clicked to open Steam it said it was not connected to the internet. I was connected as I was using the browser . I tried using support .system76.com. I typed in sudo apt install steam. All went well until I clicked on the steam icon in Pop shop. I was hoping to get to " enable steam play ( Proton ). It would not allow me to connect to the net. Please bare with with me as this is my first time to actually go all out to to change my system over from Windows. At 76, I am not the best in remembering things. I will give it a go anyway. If no help is available, no problem, thanks anyway.
All the best.