First of all, Go to the official website of GoDaddy's.
Go to the homepage and enter the icon of sign in.
A drop-down menu with fast links will appear.
Then, Go to the GoDaddy Webmail Login page and enter it.
Enter your email address and password next.
To access your account, enter the button of Sign In.
See Also this post:- http://assistsuite.populr.me/how-to-secure-godaddy-email-login-and-webmail-login