22D-Link DIR-890L User Manual
Section 3 - Conguration
Step 4
You will see the welcome screen. Tap Start to proceed. When the Operation 
Mode screen appears, tap Next.
Step 5
At this point, make sure that your 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-890L. 
Tap Next to automatically detect your Internet connection and proceed 
to the next step.