D-Link DSL-2600U User Manual page 23

Click the button labeled Add Wireless Device with WPS， you will
enter the following screens.
The following table describes the labels in this screen.
LABEL
Auto
Manual
Click on Next to continue, or Cancel to exit the wizard without saving.
Select this option if your wireless device supports WPS (WI-FI
Protected Setup).
Select this option will display the current wireless settings for you to
configure the wireless device manually.
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DESCRIPTION