De-authorizing my kobo.

Have followed the 3 steps for de-authorization but cannot get any further, my password is not accepted (and there is NO forgotten password button on my page) Have tried numerous ways to get around this, but it all comes back to this same problem, not accepting my password.  Have even tried un-installing the adobe programme, to start afresh, but when I re-install it it comes back to the original, including all my books.   Any suggestions?