how to install qt creator on mac os x snow leopard?

I have a very very newbie question. I downloaded and installed qt libraries on my mac os x snow leopard. Now I want to install qt creator. I downloaded that .dmg file and what to do next? If I open it I see some .app file and a folder nearby. Yes, I can launch the IDE, but I guess it must be placed to some certain location on my machine, but I don't know what to copy and where. I can't find any explanation regarding that.

I tried to drag "Qt Creator.app" to Applications, not sure it is correct. I see some strange icon in the list of application (see the image attached).

Also should I change something in order to start developing or is it enough to use the default configuration?

Ok, it seems I installed Qt Designer. Now when I try to open .pro file I get the message: "Please add a qt version in tools/options or via maintenance tool of the SDK". How to add a qt version, I don't even see the "options" item in the "tools" menu?

Seems that you have installed Qt Creator, or you wouldn't have a Qt Creator.app file. You need to start Qt Creator and tell it which Qt installation(s) to use to build applications. You do this from the Qt Creator Tools menu, Options... item.

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You need to start Qt Creator and tell it which Qt installation(s) to use to build applications. You do this from the Qt Creator Tools menu, Options... item.

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I don't see the item called "options" in the tools menu. I attached the image.

If I choose Qt Creator -> Preferences, I see the Qt versions window, but Qt version and qmake path seem to be already defined. No idea what is wrong.