leejosepho on "Can't access wp-admin. Error message."

Are you aware of there being three sets of login credentials involved here?

1a) username & password for server access at your host;
1b) FileZilla uses the above;
2) MySQL username & password in wp-config for WordPress database access;
note: might or might not be the same as for server access (1a, 1b)
3) WordPress username & password for accessing your site.