Photo Gallery does not work

I want to create a page with an image gallery. more I upload photos and finalize the page. the page does not work Gallery. how do I function as page gallery?

this is the site:
www.flairmanbartender.com.br

the page that has the gallery is in the gallery menu

I await help !!!

Hi!

Here is an intelligible instruction on how to create and use gallery with WordPress:
https://codex.wordpress.org/The_WordPress_Gallery