Create an free account on https://azure.microsoft.com/en-us/account/ On the dashboard choose to create an SQL Database. During creation make the database public accessible in the networking tab.
Then from the menu you can choose to get the connection string:
Then copy the JDBC connection string and replace the password.
Use the JDBC connection string in the DbSchema Connection Dialog / JDBC URL tab. In the connection string replace the '{password}' with the password you have choose when creating the database user.
If the database was not set public when created, you may need to add a firewall rule to allow remote access. In this message you can see your client IP:
Then from the top menu create a firewall rule for it.