In that case, I assume you would:
Go to the "voodoo"
section of the repo.
Download an appropriate configuration file
Load it into the VPN section of Network Manager - you may have to separate out the certificate into separate file or simply download it from here
Enter your credentials - username is the hashed token, password can be anything (but must be something
- even a single character).
The voodoo nodes use GRE tunnels, so they are fully transparent to an OpenVPN client.