Method 1:
Disconnect all network connections on the router and then reconnect.
Method 2:
1) Log in the Home page (refer to "How can I access the Home page?")
2) Go to Settings > Advanced Settings > LAN
3) Change the IP address of the router on this page.
For example: The current Gateway address is 192.168.1.1, the start IP address is 192.168.1.100, the End IP address is 192.168.1.200. You can try to change the Gateway address to 192.168.2.1. Meanwhile, set the start IP address to 192.168.2.100, set the End IP address to 192.168.2.200.
Note: After being modified, the web site to access the Home page is http://192.168.2.1.
4) Click Apply > OK.