The basic setting is “Settings->Mail->Accounts->Fetch new data”. Make sure “Push” is selected. Then each account will have an individual setting to pick: manual, fetch, or push. But, not every server supports push, so you might end up with a mix of things that will push, and others that fetch every 15 minutes.
I don’t use godaddy, so I’m only guessing here. Have you tried to enter the name (even though there is no way it would find them) and then see if it figures out it can’t look them up and maybe then it’ll prompt for an IP instead?