Having trouble logging in?
Verify you‘re entering the correct user name in the form of an email address (firstname.lastname@example.org).
Passwords are case sensitive, so ensure you don‘t have caps lock enabled.
Your account may be temporarily disabled from too many failed login attempts.(No of attempts : 3)
If you‘re logging into a sandbox account, make sure you‘re connected to https://test.salesforce.com.
If you still can't log in, enter your user name to reset your password.