D-Link Wireless ADSL2/2+ 4-port Ethernet Router DSL-2640U - PPP Username and Password; Network Address Translation Settings

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PPP Username and Password
Now, enter the PPP username and password as given by your ISP. Then decide if
you will be using any features such as Dial on demand, PPP IP extension, Keep Alive
and then click on Next.
Network Address Translation Settings
The next step is to configure the Network Address Translation (NAT) settings. For
the example, NAT will be enabled. The remaining fields are left as default and
then click on Next to continue.