PostgreSQL 10 windows username and password.

You can refer these blogs to reset password of PostGreSQL as reader has committed sin by installing PGSQL on windows platform because of which they can't get entry into holy Heaven of PostgreSQL.

By the way, default username of PGSQL is  postgres

1.  https://rationalpie.wordpress.com/2010/02/18/postgresql-reset-root-password/
2.  https://humaninbox.wordpress.com/2012/12/06/how-to-reset-the-postgres-users-password-in-windows/

If you went mad because of heavy PGSQL console, try this IDE: https://www.heidisql.com/

Hope this helps.