Number pages differently in different sections on MS Word

This one is a common request, the best I can found is the following:


Here is the official answer from Microsoft
Number pages differently in different sections


However, the steps are rather complex, the one really helped me is this video
Insert Sections with Different Page Numbers (Word)

For me, it needs extra steps:

1. Following above steps 
2. Right click the page number (the "Page Number Format" dialog should show)
3. Make sure the radio button 'Start at" is selected instead of "Continue from previous section"