D-Link DWA-556 User Manual page 15

Section 2 - Installation
Push Button Configuration (PBC)
To connect to your network using the WPS push button configuration
method, click the virtual button as shown in the screenshot.
Press the WPS button on your access point or wireless router within 2
minutes to establish connectivity.
When this screen appears, you have successfully connected to your
wireless network. Click Next to complete your setup.
Click Next
D-Link DWA-556 User Manual 15