If you haven't come right yet, download the Tenda WiFi app from your phone's app store. Plug in the router power and connect an ethernet cable from your fibre provider's ONU to your router's WAN port. Connect to the default WiFi network that the router broadcasts (Depending on the firmware, it may or may not require a password - if it does, the password is printed on a sticker under the router). Once connected, fire up the Tenda WiFi App, choose connection type (PPPoE), enter the credentials and save. Next configure your wifi settings and passwords. Save again. You'll probably lose connection as the various modules restart. Connect to your new Wifi Network and you're sorted!