First go to
Type in "Ipconfig" 
Make sure you run it as admin!
then find 
Now Type the ip in the Browser and it will ask you for a Username And Password
most of the time it will be
Username : admin
password is nothing
if it is not Then you would have to look it up
on this Website 
Default Router Passwords - The internets most comprehensive router password database
then find Something like this 
Go down to 
Then it should say some Security Mode's Press 
WPA Algorithms should be
                  Now type in your password And save and restart your router
                  your Internet should be Having a password !
               T TKIP+AES is best connection, although not many devices support it