Link to apache instead of casaOS

Hello, I use a vps on Ubuntu. To get an ssl certificate for the domain linked to the vps, I installed an Apache web server and everything went well.
I then installed casaOS, and the installation went smoothly.
But when I enter the domain url, I get the apache index.html page instead of the casaOS home page.

And as I’m a complete beginner, I don’t know how to configure a file and where to place it in the directories so that the domain points to casaOS.

Could you help me solve this problem?
Thanks in advance