Why isn't my Wi-Fi password and username working?

Okay, I'm trying to make a minecraft server, and I'm at the part where you enter your IP Address in the URL bar. It asks for your username and password for your router. I know for a FACT that the username and password are correct, because I'm on it right now… But it says "The username and password entered do not match. Please try again." Help?

Password for router admin is totally different than the Wi-Fi password. Without knowing the router, no one can guess the default router login (most likely default will work)

You can try to reset the network name and password to be default.Step 1. Press the Start menu and choose the "Run" option. Enter "ipconfig" (without the quotes) into the Run box and click "OK." Step 2. Look for the line that says "Default Gateway." This will be the IP address of your router or modem and will appear as four sets of numbers separated by a period (for example 192.168.1.1). Write this number down. Step 3. Open your Web browser and enter the IP address you wrote down in the address field. Press Enter. Type the username and password you set for your router or modem. If you do not remember it, consult the user guide for your router or modem for instructions on how to reset your device to factory defaults. Step 4. Look for a tab or link that says "Wireless" and press it. Then, look for a tab or link that says "Security." Every device is different and your buttons may be titled slightly differently. Step 5. Look for any fields labeled SSID or WEP. These are the values you are looking for. Write them down and keep them in a secure location in the event you need the SSID or WEP in the future. And you can check more details from this link, hope it would help you, http://www.mywifirouter.me/blog/how-to-change-wep-key-and-ssid-for-wifi-hotspot/