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You can auction them here on Steemit using the @steembay bot. Alternately you can list them on the @steemmonsters market on the official webpage via going to your collection and selecting one of your cards and then clicking the sell button seen under it.

I haven't sold any cards so I don't know the full process. I assume after you click the sell button you have to select a price in which you want to sell your card for and then you will need to wait until someone buys it.

Ok... thanks.... Big big hugh from here :D

Your welcome ... thanks for the hug.