18D-Link DIR-868L User Manual
Section 2 - Installation
Step 4
You will see the welcome screen. Tap Start to proceed, then enter your 
device password and tap Log In. Tap Next once the Operation Mode 
screen appears.
Step 5
At this point, please ensure that you the router is connected to a modem.  
Plug  one  end of the provided  Ethernet cable into  your DSL or cable 
modem, and plug the other end into the port marked INTERNET on the 
DIR-868L. Tap  Next  to automatically detect your Internet connection 
and proceed to the next step.