Sorry to hear you're having trouble connecting on your Samsung device. Are you able to login at https://www.goldenfrog.website/login with the same credentials?
If so, please setup a manual connection using these instructions: https://support.goldenfrog.website/hc/en-us/articles/203815546-VyprVPN-PPTP-VPN-Setup-for-Android-4-X
but for the server address enter 188.8.131.52
Once you are connected manually, login to the app. If you have any further questions or concerns please contact our support team at email@example.com