Connection not private error after installing Let's Encrypt

Hey guys,

Maybe someone could help me here because I’m lost. So I followed DigitalOcean’s tutorials for configuring my droplet. Installing apache, mysql, etc. At some point there was this tutorial for installing a SSL self-signed certificate. I installed that one too. At some point I found about Let’s Encrypt and wanted to give it a try since the self-signed SSL wasn’t doing anything, I guess something was wrong although there were no “Your connection is not private” errors. After installing Let’s Encrypt I keep getting the “Your connection is not private” error and don’t know what to do. I googled the problem but can’t seem to find a solution to this and make the “https://” working. Any ideas?

Thanks in advance!

P.S. although I can find my way around in Ubuntu I’m not a power user so please be kind to me :)