1. Download the Open VPN config file from your dashboard
2- Go to service->VPN and enable the VPN service.
3- Set the OpenVPN client settings with the details displayed in the following image.
Note: Encryption cipher must be: AES-256-CBC .
Replace "Server/ip" with the config file location hostname value.
Replace port with 41185. It's the only compatible port for DD-WRT.
Replace protocol with the config file protocol value.
Replace username with the username displayed in the web dashboard config generator.
Replace password with the password displayed in the web dashboard config generator.
Replace the certificates and keys with the ones available in the config file.
Additional config: key-direction 1
5- Save the changes
6- Check "Status->OpenVPN" to verify that the connection is successful.