I’m not quite sure what has happened but is it possible that your wp-config.php has not been created with your install? Or is it possible that your wp-config.php doesn’t have your details in it?
Try the following: take a copy of wp-config-sample.php and open it in a text editor (notepad). Save it as wp-config.php. Now look for the following:
/** The name of the database for WordPress */
define('DB_NAME', 'put_your_database_name_here');
/** MySQL database username */
define('DB_USER', 'put_your_username_here');
/** MySQL database password */
define('DB_PASSWORD', 'put_yourdatabasepassword_here');
/** MySQL hostname */
define('DB_HOST', 'localhost');
You will have to change each of the parts that start with “put_your”. Definitely, use “copy and paste” when creating your wp-config file. The database host (along with the other database names you need) is listed under “databases” in your account.
Please remember that passwords and names ARE case sensitive.
Once you have made the changes, save your newly created “wp-config.php” and place it in your wordpress folder in the same spot as “wp-config-sample.php”.
If you have uploaded wordpress to a folder called “wordpress”, go to
your-sitename.com/wordpress/
and wordpress will begin the installation.
If that doesn’t work, try removing everything and re-installing entirely. Sometimes files get corrupted in the install.
For more information please re-read the following: https://codex.www.ads-software.com/Installing_WordPress