I Forgot or Lost My Home Network Wireless Security Key or Password
If you lost or forgot your security key or wireless home network password, check the bottom or side of the router for a sticker that lists the default password. If your router doesn't have a default password listed on the device, check the router manual. Otherwise, use a computer to find a forgotten security password or passphrase for your wireless connection .
If you still can't find the password, contact the router manufacturer or your Internet Service Provider (ISP) for support.