Help! My menu not working!

Ok, so I have been trying to do up a custom menu to show my categories as a navigation menu on my web. I’ve been browsing & googling for tips and help. I manage to get a good tutorial from here but my web just won’t show the menu on my navigation.

What happen ya?? My objective is to have different pages showing post from each category to classify the different topics I have for easy navigation but it seems like I’m not gonna be able to do so yet.

Should any of you knows how, please please teach me?

Thank you!