Can’t locate wp-config.php

Hi! I’m a total website newbie, and am terrible with pretty much anything related to them. I was trying to update wordpress today, so I decided to back up my site (for the first time). I had never even heard of phpMyAdmin, but it seemed to be the easiest way to do it according to the internet. I changed my password (since it was my first time logging in) from the random letters and numbers to something I could remember, and saved the backup. When I went back to the site, I got the ‘error establishing a database connection’ message, which after some googling appears to be because the password in my wp-config.php file no longer matches my real password. The issue is though, that this is the first I’ve heard of a wp-config file, and I can’t find it. I searched my whole computer, and all I can find is the wp-config-sample.php, and I dont remember creating a wp-config file when creating my website. This seems like common knowledge but I’m at a loss, am I looking in the wrong place, or did I miss a crucial step while making the website in the first place? Thanks.

The site is cheesyfantasycomic.com, in case that helps at all (not sure why it would but just in case)