D-Link GO-RTW-N300 User Manual page 21

Section 2 - Setting Up With a Web Browser - Router Mode
After you click Next, the wizard will appear. Select the connection
type for your WAN and click Next to continue.
If you selected PPPoE, enter your PPPoE username and password
twice and click Next to continue. Click the Account Validate
button to validate your information and make sure it is correct.
D-Link GO-RTW-N300 User Manual 17