You would need to install the Securly SSL certificate on your device to ensure that Securly is able to filter all HTTPS sites browsed there effectively.
- Your Android device will need to have a PIN set otherwise by default you can not install any certificates to the device. This is found under Settings->Security->Screen Lock
- Click on the Securly SSL certificate file securly_ca_2034.crt
- At the Name the certificate screen give the certificate name and press the OK button.
- You can verify that the certificate is installed by going to Settings->Security->Trusted Credentials->User