You may proceed with the following troubleshooting steps and it shouldn’t take you much longer than 15 minutes.
1. Please standby a computer/laptop to access to the internet and connection must be via LAN cable (connect the LAN cable to the Black port at D-Link Router and direct to the computer/laptop).
2. You may open any web browser such as Google Chrome, Internet Explorer, Mozilla Firefox and etc.
3. On the address bar, please go to http://dlinkrouter.local./ and below page will appear. (These are the defaults and if you have done a configuration on your router previously, the password may be different)
Username: admin
Password: (Leave the field blank)
4. Once you have successfully login, the router's web-based setup page will appear. Please follow below steps for the configuration.
5. From the top menu, click Settings and then choose Wireless.
6. Below screen will appear to configure the wireless setting. Since this is a dual band router, you will have 2 Wi-Fi Names (SSID); i.e. 2.4GHz and 5GHz.
i. For 2.4GHz setting, click Advanced Settings to display more available options.
ii. To change the channel, click the drop-down arrow for Wi-Fi Channel, then select your desired channel.
Choose between 1 to 13 (Suggested channels : 1,6,11). Click Save for the changes to take place.
The router will auto reboot and connection will re-establish after few minutes.
iii. Next, for 5GHz setting, click Advanced Settings to display more available options to make changes on the wireless channel for 5GHz.
iv. Click the drop-down arrow for Wi-Fi Channel, then select your desired channel from the selection.
v. Click Save for the changes to take place. The router will auto reboot and connection will re-establish after few minutes.
