This article is for cPanel Accounts. Determine where your account is with this guide.
Log into your site control panel http://yourdomain.com/cpanel (where 'yourdomain.com' is the name of your domain.)
Click on 'Mail' >> Click on 'forwarders' >> Click on 'Add Forwarder'
Under the text box for the username, type in the email address for which you wish to forward to.
Click on 'Add Forwarder' to complete the process!