Where do you find dragon coins for free on dragonfable

You can't,only when you get a dragon amulet you have the choice to buy 2000 of dragon coins.
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EDIT: Actually, there are other ways than buying to get DragonCoins, First, when you log in, head to FalconReach. There is a button in the top right corner of the screen labeled "Free DC's and Gold: Ballyhoo!" Click on it to view quick ads and get rewarded with Gold or, if lucky, rewarded with DragonCoins. Another way is to click on the link at the bottom of this answer. IMPORTANT: MAKE SURE YOU ARE 18+ YEARS OLD. After clicking this link, there are many offers to complete to be rewarded with DragonCoins. Some cost money, some require mobile phones, but, some are free too! You can watch videos, download and install games, or complete offers all to get free DragonCoins. Yet they're free, they may require some personal information, so be careful, only complete offers if you are legally allowed to and if you dont mind sharing your email or zip code.

Link to offers:
http://www.dragonfable.com/aextras/offers/default.asp