Do you have another computer that is currently connected to this router via wireless?
Ok, try the following. Click HERE
That link should bring you to your routers log in screen, if it does not stop and let me know.
If it does get you in enter admin for the user name and admin for the password. If you get logged in click on the wireless tab at the top. On this page you will see your SSID.
Next click Wireless security and here you should be able to see or change your wireless password.
If you have trouble let me know.