If you've followed that guide, then you'll need to take only a few additional steps to allow a remote MySQL connection.
First, you'll need to edit the MySQL config file, using:
Arrow down to the following line:
Replace 127.0.0.1 with 0.0.0.0.
Now, restart MySQL:
You'll then need to create a new MySQL user with remote access permissions, as the default setup will not allow the root user to login remotely. You can create a new user via the "Users" tab of phpMyAdmin. You'll want to ensure the "Host:" field has "Any host" selected, to allow the user to login remotely.