Passwords

I recently downloaded an App for my iPad called "Secret Diary" - a place where I could keep all my most secret thoughts under (virtual) lock and key - which is fine in theory but it seems that when I used it the first time - and it's anybody's guess which of my innermost thoughts were recorded there - I set a password which I now cannot remember. Not quite sure how I'm going to reset the password so I can use the App - but at least it was free :)