Add link header and Home button

Hi,

I saw this question a few times on the forum but I didnt manage to get an answer matching with my case.
So, here is my blog : https://www.lucie-guyard.com/blog/
I added a few pages “Qui est la ptite Lu?” “Contact” “Newsletter”.
But as you can see, if you click there, you are stuck and can not go back to the Home Page.

I would like to add a HOME button in the menu bar but I dont know how to put a link in it and I would like the header be clickable and bring back to the Home page. But I have no idea where to put the code…

Please help me!!

Thank you very much,