Password reset fail

I was able to log with my battle net account, but when I use the icon on my desktop and try to log I can’t. I had click the on forgot password link and I received e-mails with some temporally passwords that won’t let me log and consequently I get blocked for 15 min each time.
I know I may be doing something wrong and I would like some advice to resolve my problem.

Thanks for your time again

Art