wpa2-psk

Micromax Canvas 2.2 is not connecting to netgear wnr612 router although other devices are connecting properly, while tapping the ssid , nothing happens ...says "Saved, secured by wpa2-psk" ...have reset wifi in cell phone n also router bt nothing changed

I recently changed my modem's setting from OPEN to WPA2-PSK and so i also changed my passwords, modem ip address and its password, Now i had lost my modem ip address and wpa2-psk password so i am not able to use wifi anymore. What should i do? Thanks