Change app name in apple store of an already released/available iOS app

I released an iOS app in the Apple App Store some weeks ago and now want to rename my app (I only want to add a space). I did not find an "edit name" button in iTunes Connect or a solution via google.

Can someone tell me how to rename the app? Is it enough to rename the app in Xcode to get the name to automatically updated with the next Apple approval? Or do I have to release a completely new app with the new title?