1045 Access denied for user 'username'@'localhost'

1045 Access denied for user 'username'@'localhost'(using password: YES)

I am newbie to all this web hosting stuff but I do looked up a lot of related articles and tried many ways to solve it but problems still here. Really need help.

This is what my website shows now. I have looked up many articles here and all of them mention edit file (config.inc.php) via Xampp. But the problem is I am not using my own computer as the server and I am paying for hosting.

So, how can I solve this through my cPanel? I cannot locate the file (config.inc.php) in my File Manager of my hosting.

Also,the user get access denied is the admin user as I do not create any new user for the web so I wonder why I will receive access denied for my admin user.

I am quite hopeless at this point. Hope some of you can give me some insight on what's going wrong. Thanks a lot