The Securly SSL certificate ensures that you are able to filter HTTPs sites correctly. You would need to install the "securly_SHA-256.crt"certificate to your Internet Explorer for this. The process for importing the certificate is explained here.
To verify if the SSL certificate has been installed
- Navigate to Tools > Internet Options > Content > Certificates
- Scroll through the list of certificates under the 'Trusted Root Certification Authorities' tab for certificate issued to securly.com