Remote access to MYSQL database from Dreamweaver CC

personally, I have few applications that reside locally on test servers, applications that then need to be pushed online, in fact, I work most of the time online directly on applications that are in production.
I don't know if this is your question. but if you need to connect to a remote database, you need to know the url of the MySql server, the name of the database, the user and his password.
if you didn't create this database, you should contact the network administrator who set it up.

another possibility, as Paul advises you, is to access this database from the administration interface of your server. you can then either reset the database user's password (if you don't know it and if you are sure to be the only user of this database) or create another and different user

Copy & paste this code into a new PHP file called test.php and upload to your server. 

<?php
$con = mysqli_connect("localhost","your_username","your_password","database_name");

// Check connection
if (mysqli_connect_errno())
  {
  echo "Failed to connect to MySQL: " . mysqli_connect_error();
		}
		else echo "Successfully connected, happy coding!"
?> 

<?php phpinfo() ?>

During development and debugging, I prefer to work locally which is to say I DO NOT connect with remote server data.  Instead, I export remote data to SQL and then import the SQL file to my local server's database with phpMyAdmin.  When I'm convinced my app works as it should locally, then I deploy it to the remote server.

I have phpMyAdmin on both servers.  It's a very useful app for working with SQL data.  Get familiar with it.

phpMyAdmin Documentation

https://www.phpmyadmin.net/docs/

if the hosting includes cPanel look for an options Remote MySQL and add your IP address, usually you need to whitelist an IP to allow remote access to MySQL. If no cPanel option is available check with your hosting company.