Download StrongSwan Client from Google Play
Get credentials to use to authenticate in the StrongSwan app (requires a pro account).
Click "Add VPN Profile"
Input the Server address, username and password as provided on the Profile Generator page.
This username and password will NOT be the same as your Windscribe login.
VPN Type should be "IKEv2 EAP (Username/Password)". Hit Save.
Click on the profile you just created to connect.