How to Link properly my pages

Hi ! I am trying to link my pages together… and it doesnt work when i click on them ! It says : page not found…
Cans someone hep me ?

Here is my site Read-Only: LINK
(how to share your site Read-Only link)

Hey Djiana, you’ll need to publish a readonly project link.
In your case it’s difficult to imagine what you’re doing, so a video of the problem would help too.