Get OpenVPN Config file and credentials (requires a pro account).
Open the QNAP web QUI, go to the "App Center" and search for "QVPN Service" and install the app
Open the QVPN Service app and click "VPN Client"
Click "Add" at the top:
Choose "OpenVPN" and import the .ovpn config file from Step 1
Fill out the fields as follows:
Username: Username from Step 1. This will be different from your Windscribe username.
Password: Password from Step 1. This will be different from your Windscribe password.
Check all 3 boxes and click Apply:
Click the "Connect" button
It should say "Connected" if the connection was successful.