Username & password reset to multiplay

Hello friends,
I have a DNA A211-1 modem. My username & password gets reset to multiplay when ever modem is switched off. Once again with multiple try's i get the username & password set & get internet work by 192.168.1.1 .
Can any body help me to keep my configuration permanently stored in the modem. so that i am connected always with out re configuring every time i switch on my modem.....

dodo :-)