cpanel error and ssl

an input error in please cpanel corrijao isu despite
My https://megaware.usa.cc site does not recognize 100 % of my certicado peopl that a glance at min ( recognition error ) my avast
I have other sites in this host and does not have the same error
https://niferpvp.ml

Hello,

Actually both domains show this security warning. This is because Startcom isn’t universally recognised, furthermore your certificate appear to be unsigned. A unsigned certificate will create a security alert, since most phishing sites use self signed or unsigned Certficates. The certificate you have is not signed. I suggest visiting Comodo.com if you would like a 3 month free SSL certificate.

Both domains seem to be working fine from here. Note that it can take a while for the certificate to be accepted everywhere due to caching.

How do we install certificate from comodo?