All the methods I know requires the Gash ID/ pass to be known... and both of them are very tedious and will change the way you log in forever
This is done through 'beanfun!' and it requires you to download a few programs. Do keep trying before considering this...
There is an image where both beanfun! and Gash exist; the link to upgrade account is the little words below the 2 big buttons.
This takes you to a page with the words 'new' and 'beanfun!' button in the center, follow it and fill in the blanks (google translate helps).
Hope you don't have to go through all this; though, I have to admit logging into Elsword through firefox is kinda fast.