This simple guide should walk you through setting up your domain to work with Google Apps (Mail).
Login into your cPanel (which is usually available at 'http://yourdomain.com/cpanel' -- where yourdomain.com is your actual domain name)
Navigate to MX Entry
If you have only one domain on your account, you will see MX Entries at the bottom of the screen, if you use any add-on or parked domains you may have to select the domain you wish to edit from the dropdown menu
If there is any MX Entry already present for the domain, delete it
Add the following records:
Additionally, you may want to direct your mail.yourdomain.com record to Google Apps so that you can, for example, use it to login to your mail interface. Wait out the DNS propagation -- this can take up to 48 hours on some networks, however it's usually less time.
To do this:
Open up Advanced DNS Zone Editor in cPanel
You will see a mail.yourdomain.com record (where yourdomain.com is your actual domain name you're adding Google Apps mail for) there which is a CNAME record, please change it to ghs.google.com
After the DNS propagates, this record will begin to function.
Please feel free to open a support ticket if something seems not clear here or you need any assistance with the above.