First check your account is activated or not. Have you got any notification on your another mail account which you filled on registration time on yahoo.
Yesterday I have login into yahoo account but when I have pressed submit button the Untrusted connection message show. After this message yahoo mail page didn't open. Next day, again I have login into yahoo account by another ID then same message show. I can't understanding why this happening. How can I solve this problem.
First check your account is activated or not. Have you got any notification on your another mail account which you filled on registration time on yahoo.