Unlimited E-mail aliases means that you can use anything@yourdomain.com as your email address. For example, you may want to use a few different email links on your site such as ...
support@yourdomain.com
info@yourdomain.com
webmaster@yourdomain.com
me@yourdomain.com
You do not need to do anything to get anything@yourdomain.com to forward to your primary POP account.. We set this up as a default when your account was setup.