D-Link AC750 User Manual page 22

Section 3 - Configuration
If the router detected or you selected Static, enter the IP information
and DNS settings supplied by your ISP. Click Next to continue.
For both the 2.4GHz and 5GHz segments, create a wireless network
name (SSID) using up to 32 characters.
Create a wireless security passphrase or key (between 8-63 characters).
Your wireless clients will need to have this passphrase or key entered
to be able to connect to your wireless network.
Click Next to continue.
In order to secure your router, please enter a new Password. For added
security, check the Enable Graphical Authentication box to enable
CAPTCHA graphical authentication. Click Next to continue.
D-Link DIR-818LW User Manual 17