In almost all cases DSL Modems are provided configured in a 'Bridged' state. This means, that the connected device, whether it be your computer or a router; has to perform PPPoE Authentication.
Simply connect the Ethernet Cable from your modem to the Internet or WAN Port on your router. Instructions for how to configure your router to perform the PPPoE Authentication can be found in your routers user manual. Usernames and passwords will be provided by KELCOM Staff.