Installed certificate, can't access gui from chrome, how delete certificate from apache config?

Can I get rid of the certificate completely and turn off https? Chrome won’t let me continue even if I click advanced. If I delete the certificate in the manager, it is still imported into the apache config? I had changed the hostname on my server earlier on, could this be causing the problems? I really need some help with this. I can’t find documentation anywhere on how to turn off https.