The following are the simple steps you need to follow to recover the access to your account:
- Close the entire browsers tab and restart after some time
- Make sure you have mentioned the correct credentials
- Verify your internet connection
- Clear your browser history, cache or cookies
In case you are still coming across the issue, then you should try to reset the password then you will be able to access your yahoo password.
Know More ~ Original Source: http://emailtechnicalsupportt.mystrikingly.com/blog/fix-yahoo-login-issues-now