How to Add a Trusted Certificate Authorityby Joshua Laud
If you are security conscious, then you may have enabled higher levels of security for Internet browsing than are set by default. If this is the case, then certain websites will require Trusted Certificate Authority to gain access. You can add a Trusted Certificate Authority by attempting to view the website that requires the certificate. From there the certificate is added and installed correctly.
Navigate to the website that requires the security certificate.
Click "Yes" when the security alert prompts you to install the certificate.
Click "Install Certificate" and click "Next."
Click "Place all certificates in the following store." Click "Browse." The security folder will already be open. Select "Trusted Root Certification Authorities" from the available folders then click "OK."
Click "Next," then "Finish." You have now added a Trusted Certification Authority.