You will need this file 

1.  
2. 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

1. Click on the Securly SSL certificate file that you want to install.    Download here
2. 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