I put a small amount of DRK (less than 10) and .5 BTC in Bitfinex to give it a test drive.

I'd much rather have cash as my margin basis rather than crypto but it seems the only way to do so is to place a margin order for BTC and then claim which is fine (unless there is another way).  My DRK and original .5 BTC is untradable in the Exchange (I found a workaround for BTC as state previously or perhaps its the way its supposed to work) but for DRK I'm not sure how to convert to USD?

Suggestions?  I'm sure I'm missing something simple.