Login to your Cpanel by using the link www.mydomain.co.ke/cpanel. Replace my domain with your domain name. You will need to use the username and password that you were provided with.
Scroll down and Click on Email Accounts Icon
Fill in the desired username e.g. yourname under email slot. If your desired email address is email@example.com, you just need to type yourname.
Input desired password
Enter the password again
Select Mail box size quota (or leave the default value)
Click Create account to finalize creation of account.