I don´t know specifics of that provider, but if they have config files for openvpn or wireguard you could download and import those into the native network settings in your desktop enviroment. Plasma and Gnome support both, i think Budgie only has openVPN support. Unfortunately i dont know about XFCE.
knuckle suggestions for another free vpn ?
Proton VPN has a free tier and can be installed from the repo.
