You will need to install the Securly SSL certificate on your device to ensure that Securly is able to filter all HTTPS sites browsed there effectively.

1. Your Android device will need to have a PIN set otherwise by default, you will not be able to install any certificates to the device. This can be found under Settings->Security->Screen Lock
   
2. Click on the Securly SSL certificate file securly_ca_2034.crt  
3. On the "Name the certificate" screen gives the certificate a name and press the OK button.
   
4. You can verify that the certificate is installed by going to Settings->Security->Trusted Credentials->User