Error Establishing a Database Connection

Hello,

whenever i try to go to my admin/login page for my website, it does not load. After a while it shows the “Error Establishing a Database Connection”. I have no idea how to fix this.

I did look at this site: http://www.wpbeginner.com/wp-tutorials/how-to-fix-the-error-establishing-a-database-connection-in-wordpress/

but i’m lost & confused on how to go about this:

You can do this by adding the following line in your wp-config.php file:

1define(‘WP_ALLOW_REPAIR’, true);

I have no idea what this means.

Once you have done that, you can see the settings by visiting this page: http://www.yoursite.com/wp-admin/maint/repair.php

I use a macbook if that means anything. Thank you.