*** Below information is generally not needed for any android device. This is only for additional reference incase your device is very old and may need it.
Install CA certificate
1. Copy the certificate from https://d221co84m5tvhm.cloudfront.net/OpenVPN-
Config/serverlocation.crt to the root of your device's internal storage (that is, not in a folder).
2. Go to Settings > Personal > Security > Credential storage > Install from storage.
3. Touch the filename of the certificate to install. Only certificates that you haven't already installed are displayed.
4. Touch OK.
5. Enter a name for the certificate “serverlocation” and choose VPN and apps.