Hi everyone ,Nex here

I´m known as Nex and I just started coding, I learned about freecodecamp a few days ago and I’m stuck on a problem. I can’t seem to use footer in my code, what can be the problem?

If you need help please post your code and the link of the challenge (or the exact name if you can’t post links)
The Ask for help button is there to create a post with all the needed informations right away