Super administrator doesn't enter

[qaona]

The system doesn't recognize the password or user of Superadministrador. 
How do I do to change user and password of Superadministrador?

[datahell]

You can change the password of super administrator from your database manager (phpmyadmin).
Go to table #__users. Find the "admin" row and click the pensil icon to edit it.
On the "password" column delete the old password and write a new one.
Select this value to be encrypted using MD5 from the left selection box.
Click save, done.