How do i change the SSL Certs in the UI

hi i have made an foreman 1.23 server on a single server, and have replaced the UI cert to a signed cert…with this guide…Foreman :: Replacing Foreman's web SSL certificate.…when i try to connect clients i get this error…

Error: Could not request certificate: SSL_connect returned=1 errno=0 state=error: certificate verify failed (unable to get issuer certificate):…

is this guide not the correct way to change cert anymore ??..if not how do i do it.