Password lost – error database connection

I ask hostwp to install wordpress for me and I receive an email with a link to finish the installation. In this link i had to enter the name the password… The password was asked only once.

When I tried to go into my web/wp-admin the message was that the password is not correct, I try to recuperate it, I wrote my email address but it said that in my host the mail function is not actived.

I tried to find a solution in the forums, I deleted the databases and the users and I tried again. Now the message is the next one:

Error establishing a database connection
This either means that the username and password information in your wp-config.php file is incorrect or we can’t contact the database server at localhost. This could mean your host’s database server is down.

Are you sure you have the correct username and password?
Are you sure that you have typed the correct hostname?
Are you sure that the database server is running?
If you’re unsure what these terms mean you should probably contact your host. If you still need help you can always visit the WordPress Support Forums.

What can I do?

Im sorry my english is not so good.

Thank you,

Naiara