First You can reset all settings of router with RESET button.
Press it for 10 seconds .
RESET button is in back side of router.
Then connect your router to computer with ethernet cable.
Then you can access your router configuration with
http://192.168.1.1
or
http://192.168.0.1
user name as "admin" and password as "admin"
or blank or "password"
then configure your router as WEP if u want security.
Then enter WEP key it is your password to connect internet from wi fi.
if you want automatic ip then enable DHCP.
Then save settings and restart router.
Let me know if you need more asistanse.
Thanks.