Using Qt Designer on Qt Creator

Hi guys,
I have a problem with my Qt Creator, it seem to only have a C++ editor which is very powerful yes, but i need to work with the Designer instead and i cant seem to be able to use it on the Creator software i downloaded. I tried manual download on the maintenance service provided but it wasn't even there to be included for download. Please help me.

The Designer components are accessible in Qt Creator using the "Design" tool in the left toolbar of the program. This is accessible when you open a *.ui or *.qml file or create a Qt Designer Form or QML file in your project. The button is inactive the remainder of the time.