D-Link DIR-890L User Manual page 21

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 segments, create a Wi-Fi network name
(SSID) using up to 32 characters.
Create a Wi-Fi password (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.
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