D-Link DWA-140 User Manual page 14

Section  - 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-140 User Manual 14