Hello,
While their VPN is not officially supported on our devices, by following these instructions you should be able to upload the generated .ovpn file to our device. This can be done by navigating to Services → VPN → OpenVPN and creating a new Client instance. Then, enable the instance, and select the option "Enable OpenVPN config from file". Upload the file downloaded from their site, and also check the option "Upload OpenVPN authentication files". Here, the certificate files can be uploaded.
Best regards,
DaumantasG