Your 'goose ID' is the variable at the end of your /play bookmarklet. Ask Liam for this if you don't have it, and do not share it with others. Sharing this will let others play videos under your name.
Your /play bookmarklet should look somthing like this:
javascript:(async%20function%28%29%7Bdocument.body.insert.........
Copy your /play bookmarklet, then go to this website to format it properly by clicking 'Decode'. Once your bookmarklet link has been decoded you should see your goose id at the end. It should look something like this:
"&goose=pavufo987285erlkovlh"
Copy the ID value (the text after '&goose=', and without quotes. This is the ID you need to use for this website. Do not share it with anybody!