If you only want to forward email and not leave a copy on the server login to your domain control panel:
Select 'Forwarders' and make sure your forwarding is in place.
If needed here a tutorial on how to setup email forwarding
Now that you have the forwarding in place go back to the main screen in your domain control panel and select 'Mail Accounts'
then Add/Remove the Email Accounts that you only want to be forwarded.
How to create or delete an email account tutorial