I uninstalled WP twice and reinstalled it for the third time, dropping the previously created data banks. Since I used phpMyAdmin to change the password last time, when I installed for the third time, the WP program assigned that password. The database name is correct, the database user name is correct, the password is correct, the database host is correct, but I still get the same invalid user name when I log in.
After I install and look for wp-config-sample.php, I also find wp-config.php, which is already filled with the correct information. Should I be ignoring this file and filling in the sample file and then resaving over the wp-config.php that’s already there, because it looks to me like the information is going to be the same.