Once you have a wifi connection the next things you need to connect to the internet are
an ip address (would imagine 192.168.0.x)
a subnet mask (with above would be 255.255.255.0)
a default gate way IP address (should be ip address of wireless router - probably 192.168.0.1)
and a DNS server IP address (could be either the same as default gateway or something else such as 212.103.224.51)
You need the address and mask to identify you on your home network and what your home network is. You need the default gateway address so all trafic not local to your network (ie internet!) can be passed to your router to be sent to your isp. You need the dns address so when you type
www.oople.com into your browser it can ask a "domain name server" what the ip address of
www.oople.com is ( 87.106.142.119 in case you were wondering) then it knows to send your request to that IP address.
If you are missing the dns info you could try open a browser and type the oople ip address in the address bar where you would normally put
www.oople.com. if it connects to oople everything bar dns is working.
Hope that made some sense.
Andy