If you cannot remember the password of your D-link router, then you can reset the router
to its default settings to resolve the issue. Follow the tips here carefully for D link
DAP 1520 reset:
• Keeping your router ON, press and hold the reset button available in a hole on the side
of your router with a paperclip.
• Hold the reset button of your D-link router for 10 seconds or until the LED light turns
red.
• Your router will now start rebooting.
• Now, wait until 30 seconds and then visit
http://dlinkap.local or htpp://192.168.50 to
use your default login credentials for setting a new password.
Read more
https://connectrouter.com/d-link-dap-1520-setup/