D-Link Wireless AC1200 User Manual page 19

Section 3 - Configuration
If the router detected or you selected Static IP Adddress Connection,
enter the IP information and DNS settings supplied by your ISP.
Click Next to continue.
For both the 2.4GHz and 5GHz bands, create a Wi-Fi network name (SSID)
using up to 32 characters.
Create a Wi-Fi password (between 8-63 characters). Your wireless devices
will need to have this passphrase or key entered to be able to connect
to your wireless network.
Click Next to continue.
D-Link DIR-850L User Manual 14