For using the godaddy webmail firstly you should create an email account on Godaddy. Godaddy provides you a professional email with your custom domain. Follow few steps to create Godaddy webmail account:
1.Go to chrome and visit the Godaddy "workspace control centre" login page.
2.Click on the "create" option at the top right side on the screen.
3.Then, select the “create a new account” option.
4.Next, create your email address using your custom domain.
5.Create your strong email's password.
6.After that, click on the create button.