Before changing anything
Make sure you know how to access the router's official app or administration page and, if possible, connect one computer by Ethernet. Do not factory-reset the router simply because you forgot the Wi-Fi password.
Change the network name
Open the wireless settings and edit the SSID. Choose a name that identifies your network without exposing unnecessary personal information such as a full address.
Choose a strong Wi-Fi password
Use a long, unique password and WPA2 or WPA3 security where available. Avoid WEP and avoid reusing an important email or banking password.
Reconnect your devices
After saving the change, phones, laptops, TVs and smart devices will usually need to reconnect using the new network name or password.
Do not confuse Wi-Fi and admin passwords
The Wi-Fi password lets devices join the wireless network. The router administrator password controls the router settings. They should not be treated as the same credential.