Come in man! It's all there.. you needn't do anything for it to remember passwords...
as and when u type in pwds n login it would ask u for the SAVE options.
if by mistake you clicked no then you have it in the options menu!!
PS: To read this you should login!! OR sometimes you might get a notification mail.
(I dunno how u r gonna read this PS if you dont know to read the msg!! )