There are a handful of games out there that require you have your “Steam ID” number and Steam doesn’t make it really that easy to find. So I thought I would list the steps here.
Open your Steam console from your desktop and click on “View” from the top menu.
Click on settings and then click on Interface
From the interface menu: Check mark “Display Steam URL address bar when available” and hit “Ok.”
Once, you hit ok, the menu will close out. Go to your profile. Your ID number will appear at the very end of web link.
Click to enlarge.