Version, about info and icon change

I’m making good progress on my first app and was wondering how I can modify the actual version info that is shown in the ‘about menu’ in my app. I am using QTcreator on osx if that helps.

I’ve looked around for a tag that could be modified but could not really find anything.

Also, and this might be non-of related, how can I change the actual icon of the executable?