ovh.com domain: redirect from IP address to domain name

• I have raspberry pi web server in my home. It is running on apache2. Router ports are redirected and that is ok.

• That web server is accessible from internet by entering my external IP address eg. 5.123.123.123

• I want to have a domain name like www.mydomain.com rather than IP address so I bought a domain on OVH.com

• Then inside ovh domain panel, I set up a redirection: www.mydomain.com to 5.123.123.123

• It does not work, www.mydomain.com showed some OVH welcome message.

• Then I've read something about DNS servers so I've checked my router DNS addresses (1.1.1.1 and 8.8.8.8) and inserted them into ovh dns panel as well.

• Now webpage is not loading at all (no ovh welcome message).

How do I set it up properly?

Thanks for help