Simply login to cPanel and click on the 'Email Accounts' option.
on the next page, simply locate the email address that you would like to check and click on the 'more' tab which is at the right hand side of each email address. once clicked on it you should select 'Access Webmail'
you will then need to enter the password that you set for your inbox and proceed.
The next screen will display 3 email programs for you to use. This is a matter of personal choice. simply select which ever one you want to and then you will be able to read and send emails.