D-Link DIR-860L User Manual page 39

Section 4 - Security
If you selected Manually, the option to make your password the same on
both bands will be offered.
Enter your wireless password in the box below. If you chose to have different
passwords for each band, you will need to enter a separate password for
each band.
Click Next.
You will now see a summary window that displays your settings. Write down
the password and use it to access your wireless networks.
Click Save to save your settings.
D-Link DIR-860L User Manual 35