Page in catagory menu

Hi!

I’m making a website for a friend of my. I’ve found a realy nice theme and everything is working great. But now i have a problem. When i create a page it is not in the pink menu banner as espected. That banner is only for post catagory’s. Is it posseble to add a page to the pink catagory banner. You can find my website here: https://pelusas.nl/

I want the ‘webshop’ page next to the posts catagory.

Thanks in advange,

Eddie