Well first you have to post in the House of Von Helson forum, which you just did.
Then you have to find someone on the Vamps team with health below 100.
A good place would be on the newest page of a heal thread.
Look for a yellow button below their avatar that says "Heal."
Click it, if the game doesn't pop up, refresh the page and try again.
If you need help on how to play the game let me know.