Installation help for a non-technical person?

Yes successfully issued, but the web site is not coming up as secure. https://smf2.ga/
Is there another step or should it be working?

From Firefox:
"An error occurred during a connection to smf2.ga.
SSL received a record that exceeded the maximum permissible length.
(Error code: ssl_error_rx_record_too_long)"

"The page you are trying to view cannot be shown
because the authenticity of the received data could not be verified.

Please contact the website owners to inform them of this problem."

From Chrome and Opera:
"SSL connection error
Unable to make a secure connection to the server.
This may be a problem with the server,
or it may be requiring a client authentication certificate that you don't have."

Also I just saw this other thread, are people supposed to be automatically
redirected to https from the http address?