First time installing WordPress. Cant Access

The best place to start looking is always the error log of your web server.

But for the moment, the best place to start looking is the nginx log file, which according to the howto article you are linking to is here:

#  less /usr/share/nginx/$domain/logs/error.log

If there is no log file, check if the folder exists and the nginx process can write towards that file / directory.

In case you can’t get to the logs, it would be nice to know more about the error code you are seeing when you try to access with your browser.

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)