D-Link DSL-2520U User Manual page 21

Section 3 - Configuration
STEP 2: Setup Wizard - For PPPoE/PPPoA connection
Type in the Username and Password (and PPPoE Service Name, if
required by your ISP).
Click on the Next button to go to the next Setup Wizard window.
STEP 3: FINISH
Push the FINISH button to use the configuration.
D-Link DSL-2520U User Manual 21