configure apache to use let's encrypt ssl

My site is using a certificate I created a while back, something I hardly remember doing. It’s not from a cert authority so will not be considered secure. https://sfare.scoregod.com/falkenbrew/sfare/client.html?1626707979

I recently discovered the option to use let’s encrypt certificates in Settings->Security (Certificates for Load Balancers and Spaces). I’m not 100% sure I can use this though, as I don’t know what the load balancers and spaces are. But I managed to create a certificate but I do not know how to apply it.

my virtual host configuration contains following lines SSLEngine on SSLCertificateFile /etc/apache2/ssl/apache.crt SSLCertificateKeyFile /etc/apache2/ssl/apache.key

I’m pretty sure I configured this and that the .crt showing on my site is the one in this folder. I’ve tried removing these lines, but then my site no longer works as no HTTPS is available for it.

I was wondering if I somehow can add a reference to the newly created let’s encrypt certificate, but I could not find it on my server.