Navigate to the Email accounts section (cPanel >> Home >> Email >> Email Accounts).
Click on the Check Email button next to the account that you wish to access.
View the email-configuration screen where you can customize many aspects of your email such as auto-responders, email filters, and your Webmail client.
Click Open once you have chosen the Webmail client to use (by default this is Roundcube).
Access the Webmail interface to view or send email (this method does not require you to input the email password).