Open this link to get OpenVPN for Android, it's free.
Now you have to download configuration files from locations. You may choose one or download all of them and then use it.
Run OpenVPN and press Import Profile.
Pick the .ovpn file you've got on Step 2 and press Import.
Change the name if needed and then indicate your VPN99 credentials you've got upon registration. Press ADD.
Confirm creating a new VPN profile.
Your OpenVPN profile was configured. Now all you need is to activate it when needed:
Your OpenVPN connection is now activated!
If you don't want to use OpenVPN for some reason, you may still use VPN connection on your Android device setting it up using built in PPTP-client as instructed below.