Hi Bdjuf welcome to the board.
When you open up your account with td waterhouse on the application you fill out you need to check mark the Options and short selling fields for TD waterhouse to enable those options for you.
If you didn't do that, you should call the tdwaterhouse team and ask them to modify your account to enable those features.
You can trade commodities through etfs (Exchange traded funds) You can find a list of them at:
http://finance.yahoo.com/etf/browser/mkt
If you want to trade the actuall commodity futures, TD Waterhouse doesn't allow you to do that. You would need to open up an account with
http://www.interactivebrokers.ca
I hope this helps you out!
