You can set up your email account to work with Google Apps by using a simple wizard that is available on your cPanel account. However, it is important to understand that thereafter your mail service will be hosted by Google Apps and will not be available from your account server. This can though be reverted in the future if you decide to step away from using Google Apps.
The first step is to log into your cPanel account. If you are unsure on how to do this, please view the following help article - 'How to log into cPanel'.
Once you have successfully logged in, either type email into the search box or scroll down to the 'Email' section as per the below. Select 'Remove MX Wizard' as shown.
Select your domain from the drop down list.
Select the 'Additional Services' that you would like to configure with Google App by ticking the respective option. Choose 'Continue & Configure the domain with Google Apps' to proceed to the next step.
Accept the confirmation by choosing the 'OK' from the prompt dialogue.
After a few moments, you should find that the wizard has added the required MX records. When prompted to 'Go back', the process is complete.
Your email has now been successfully setup to work with Google Apps.