Download the server configuration files that you want to use HERE.
Open terminal and type the following command (or copy and paste it) and press Enter (keyboard) to execute it.
sudo apt-get install network-manager-openvpn-gnome
And then add an OpenVPN connection from Network Manager which, after the command above, allows the import of ovpn files.
Click Create and add the .ovpn profile that you want to use.
Insert your credentials and save. You can view your credentials for the VPN in the Customer Area > Services. Note that credentials are case sensitive.
Connect to VPN from Networks.