I have very stupidly overwritten the Zen Cart database on the server. My web host has kindly restored the database with a recent back up. They are now telling me that: "You can connect your account to it again, but will need to create the SQL user for it again."

I have created the SQL user as it was before. How do I now connect the account to it again"? I tried uploading the config.php file in includes and the config.php file in admin but there is no change to the error messages I am getting.

These are:

When I try to connect to Zen Cart admin:

0 DB_ERROR_NOT_CONNECTED
in:
[select * from project_version WHERE project_version_key = 'Zen-Cart Database' ]
If you were entering information, press the BACK button in your browser and re-check the information you had entered to be sure you left no blank fields.

AND

When I try to access the site I get:

Sorry!
There seems to be a problem connecting to our database. Please give us a few minutes to remedy the problem. Thank you.

Would really appreciate any help that someone could give me.