Forwarding email means there might not be a mailbox for that email address. Think of it like moving house and having the post office forward your mail to your new place.
Maybe you already use another email address as your primary contact, forwarding email there is easy. But it might not be the best solution - read this
In your control panel go to the email section and click on Forwarders.
Enter the email address you want to create e.g. info@, and if you have more than one domain, choose the one you want to use e.g. 123host.com.au
Then enter where you want email to be sent e.g. 123host@MyOtherDomain.com.au. Then you get to do whatever you usually do with emails at that address