Japanese page is HERE

As a startup screen

By clicking right mouse button...

A program code for displaying 'Hello!' shows up...

By clicking the [build]-icon...

A dialog prompting you to input your filename (to input 'test' is an example)...

There is a dialog with the folder name, where your source file is to be saved (just click the [OK]-button, anyway)...

Some messages are shown in the 'Build' window at the bottom...

By clicking the [Execute with Message]-icon...

another window with the results of this executed program shows up...

Let us [Create Function List]...

The function name of [main] is listed in the box...

If this [main] is selected...

You are moved to the line, where [main] is described...

As an IntelliSence,  if you just type pri, an appropriate list containing words that begin with [pri] shows up by pressing  [Alt+Right Arrow]-key...

 and to click [printf] in the list replace [pri] by [printf]...

Set the mouse cursor onto [printf] and press [F11]...

Then, you move to the line, where the definition of the proto-type function for [printf] is described...