You sure can! If you wish to manage your incoming emails with Google Apps, you need to point your domain's MX records to Google first. Access your website's hPanel and locate the Edit MX Record menu in the Emails section.
Locate the Point mail to Google section, where you can create Google MX Records for your domain name. Just select the domain's name you wish to use with Google and click Create Google MX records. After that, you should be able to use your email accounts with Google.