Your client can't connect to your emulator. Check if your connection can be found by useing canyouseeme.org.
If that doesn't work check your firewall and your ports
If it finds your connection check the ip and port in your client.php
Good look!
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Ive tried this tutorial on different os'es , on different machines, helped a lot of people via teamviewer and even did this tutorial on my school bypassing a firewall. This tutorial definitely works and if you don't even know how to click a link to phpmyadmin you shouldn't be making a retro.
Did you need to use a password when accessing localhost/phpmyadmin ? If no then don't fill in a password. Leave the domain for now as you need to change more files when using a domain.