The database server could be connected to (which means your username and password is okay) but the nmfkqoda_wp903 database could not be selected.
nmfkqoda_wp903 have permission to use the nmfkqoda_wp903 database?username_nmfkqoda_wp903. Could that be the problem?If you do not know how to set up a database you should contact your host. If all else fails you may find help at the WordPress support forums.