Pannus
OK, hard to do when I don't know your router, but you can look up the default username and password for the make on the internet
Then, in the task bar, type 192.168.1.1
Usually, the default username and password are 'admin' or 'administrator'
If not, check the user manual or the provider if they gave you it
All being well...you should be now be the router settings,
then, you have to find the passsword menu bit and change it. And record it . Also, have a fish about for other settings which are open. If in doubt, change one thing at a time, and if you are havng problems, then go back and change the last thing you did.
Be precise with your password and write it down, very easy to forget
If you do forget, there is a reset button on your router but it will wipe all the router settings, so you need to take a note of these before you ever have to do this, but you can get them from your internet provider. PM me if you have prob. HTH