Hi,
When you load your script into Vizard, take a look at the Resource window. The filename of your avatar should be listed there. Click on the + symbol next to the name to view expanded information about it. There will be a subitem named "bones". Expand this to see a list of all the bones of the avatar. Click
here for a link to a thread which includes a picture of how this will look like (Scroll to the bottom of the page to see the picture).