Hi Sue, if you tell us the make of your router then someone with the same will be able to tell you what to do.
If it is a Belkin then type
http://192.168.2.1 into your address bar at the top of IE or firefox or whatever browser you are using.
on the first page of your router type in the password if you have created one here, most people don't. Then click on submit.
somewhere you will see your SSID, just like a log-on to, say, Rootschat.com
then if you click on the security button you will go to a page with key 1, key 2 & 3 & 4. If a key has NOT been set then the row is a series of 000000's. My first row has been set by me with my own code with the same length as the series of 0000's.
This number is like the password you use to log-on to rootschat, along with your log-on name.
So your router will be secure using (log-on) SSID and (password) Key 1 (or more if you can see the use).
Of course anyone wishing to connect to the internet using wireless and your router will need to know these two items in order to log on to your router.
cheers, falcybe
ps: if you have another make of router then the access to its codes could still be
http://192.168.2.1 or
http://192.168.0.1 or
http://192.168.1.1. Play around a bit or read your manual. The old adage, that: if all else fails, read the manual