Error establishing a database connection

Please help!

After I uploaded WordPress folder to my server at Gandi.net, I then ran the WordPress script through my browser:
https://www.thisisbrighton.tv/wp-admin/install.php
And I received the below Error page:

—
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?
—

I have tried different ways of putting my information into the wp-config.php and none of them worked. Below is what I have done. Please could you tell me if I did the right thing?

Many thanks.

———

My Database info:

Database server
[disk=”d_MyServer”]

* Create databases
o Database
+ Name : mydatabase
+ Users
# user
* Username : myusername
* password : abcd
* Rights
o Rights : all
* root_password : ************
—
Here is what I put in the wp-config.php:

// ** MySQL settings – You can get this info from your web host ** //
/** The name of the database for WordPress */
define(‘DB_NAME’, ‘d_MyServer_mydatabase’);

/** MySQL database username */
define(‘DB_USER’, ‘d_LotusServer_myusername’);

/** MySQL database password */
define(‘DB_PASSWORD’, ‘abcd’);