All of this code gets placed inside of the Excel Workbook. With the workbook containing your dates, you press Alt+F11 to open the VBA editor. Then you need to install the Outlook object plugin to this file: select Tools->References and place a check next to Microsoft Outlook 11.0 Object Library. Now you have given excel th eproper tools to manipulate Outlook.
Then select Insert->Module, and this is where you enter code. The sample code that is listed in the referenced article is simply a set ofinstructions to create a single new appointment. In your case, you would need to write other code to loop and create one new appointment for each entry in your list.
If ll of this is Greek to you, you may wish to take a step back and learn some fundamentals before trying to move too far forward...